This PIA changes list intends to provide the PIA users with some information 
about the differences between the PIA versions. 

Because of the very flexible character of PIA and the characteristics of its
implementation, further development and maintenance, we do not intend to
superimpose large administrative tasks for its configuration control. We think 
a flexible approach concerning this point is of advantage for the PIA users,
who see a more complete and more comfortable S/W package every time they access
a new version (and this, we admit, happens very often). On the other side, we
try to keep the PIA Users Manual up to date, and increase the information
contained there. 

The list is NEITHER complete NOR gives a lot of details. It is just compiled
from the messages sent by CG to the SOC/MPIA PIA users. It starts by
V4.5, which was the first version widely distributed.

******************************************************************************

PIA V10.0 - 05/07/2002
=========

CONFIGURATION:
--------------

* PIA V10.0 is released in several versions for running on top of IDL 5.0, 
  5.1/5.2, 5.3, 5.4 and 5.5 respectively. PIA recognizes automatically which 
  savefile has to be loaded. The savefiles contain pre-compiled code for the
  whole PIA. A special package, the P32Tools, has been added (details under
  Graphical I/F section). Due to compatibility problems found, this package 
  has not been pre-compiled, but the single routines included in the path, so
  that they get compiled at the time of execution.  
  

HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 10.0 is not available at the time of the release.
  As soon as it is available, we will put it under the PIA homepage.
  
* Help pages for the P32Tools package added to PIA are available under
  [PIA_ROOT]/p32tools/help. 
  The Help button included in the P32Tools GUI is pointing to the pages.
   

GRAPHICAL I/F:
--------------

* Under Buffer -> P32Tools the special package for P32 data reduction P32Tools 
  can be started. 
  The package P32Tools was originally developed at the Astrophysics Division of 
  the MPI fr Kernphysik in Heidelberg. The adaptation of this program to PIA as 
  part of the P32Tools package was coordinated and supported by the ISO Data 
  Centre at VILSPA of the ESA Research and Scientific Support Department. The 
  GUI was developed at the Infrared Processing and Analysis Center at Caltech. 

* General AOT/Batch processing includes the possibility of switching between
  difference signals between adjacent read-outs for P32 mode (default) or ramps
  (which can be also subdivided). See point 1 of PROCESSING section.
  
* The use of robust bi-weight mean calculations can be customized for signal 
  mean calculations: Top level menu > Customize > Biweight means
  Defaults are: use of bi-weight mean for chopped cases AND no use of it for
  staring observations.
  
* Default for cases of two FCS measurements for calibration (eg. by maps) has
  been changed in General AOT/Batch from interpolation to average. See point 7
  of PROCESSING section.
    
* Menu for "Define Map Parameters" (called from Mapping main menu) includes the
  possibility of changing the percentile for a statistical flat fielding ("First
  Percentile Normalisation") - see point 11 of Processing section.


PROCESSING:
----------

It follows a list of upgrades, both including software as calibration files
upgrades:

 1) Glitch removal for PHT32 observations

    Similar to the processing for single pointing chopped measurements, the 
    difference signals between adjacent read-outs are used by default rather 
    than the slopes of the complete ramps. The signal per chopper plateau is 
    determined by using the robust bi-weight mean method.


 2) Warning of residual drifts in FCS calibration

    The usual exposure time of FCS measurements is 32s. This is sometimes too 
    short to achieve a stabilized signal. Since the absolute signal of the FCS
    measurement determines the responsivity and hence the absolute flux 
    calibration, any unstabilized FCS signal has direct impact on the absolute
    calibration accuracy. In case of unstabilized FCS signals, warning messages
    are written to the headers of the SPD and AAR products.


 3) Further consolidation of flux dependent signal linearization and 
    FCS characterization 

    The linearization tables P%%SLINR were updated. Since linearization curves
    and FCS power files are linked together, both were updated consistently, 
    i.e. also new CalG tables P%%ILLUM, P%%FCSPOW, P%%FLAT and PPFTOF were 
    generated.


 4) Point spread function correction factors

    New psf factors (CalG files PPPSF and PCPSF) were computed taking a
    model for the secondary tripod into account. 


 5) Orbit dependent default responsivities

    For P3, C100 and C200 the FCS measurement data set was reprocessed using 
    the correct OLP 10 calibration. Linear least median square fits were 
    applied to the data and bootstrapping on 500 data sets per detector and 
    time dependence was performed to derive the uncertainties. The time
    dependent CalG files PPRESP_01, PPRESP_02, PC1RESP_01, PC1RESP_02, 
    PC2RESP_01, and PC2RESP_02 were revised.


 6) Application of default responsivities if FCS power is 
    outside calibrated range

    In particular for P1, tests showed that more accurate photometry results 
    were achieved when using the default responsivity rather than the 
    extrapolation of the FCS power curves. As soon as the FCS heating power 
    is outside the calibrated range for the respective filter (formerly called 
    "soft limits") , default responsivities are used in calibration. A
    corresponing message is issued. This holds for staring, absolute, raster 
    and chopped photometry. 


 7) Application of average responsivities in mapping mode

    The responsivities are now by default averages of the two FCS measurements, 
    provided both are of good quality. If both are outside the calibrated FCS 
    heating power range, default responsivities are used (see item 6). If only 
    one good FCS measurement is available, this one will be taken. This is 
    particular important for sparse map measurements where the FCS settings 
    can be different.



 8) Refinement of signal correction for chopped P2 photometry measurements

    The asymmetry assumed for P chopped photometry in the so-called pattern
    analysis (default for chopped photometry) has been taken out. 
    The recommendation is to use default responsivity for this mode.


 9) Extension of PHT-S dynamic spectral response calibration to longest 
    exposure times

    Good quality measurements of 1024 seconds up to 4096 seconds were used 
    for self-calibration in that respect, that the flux was predicted from 
    the first 512 seconds of the measurement, which is based on calibration 
    standards, and transferred to the remaining exposure time. The consistency
    of the method was checked for the standard star measurements of 1024 
    seconds. Consequently the conversion factors in the CalG file PSDYNAMIC 
    were updated and the weights in PSDYNWT adapted.


10) Relative intensity profiles for multi-aperture measurements

    In ESA SP-455 (ISO Beyond Point Sources), page 41, T.G. Mueller described 
    a method how to make scientific use out of multi-aperture measurements 
    (AOT PHT04), provided the source is as compact as 2 arcmin. The background
    signal is derived from the annulus formed by the 120 and 180 arcsec 
    apertures of the on-source measurement. Therefore, only measurement 
    sequences with these two apertures and at least two smaller ones are 
    processed in this way. The background for all apertures has to be scaled 
    with regard to the 180 arcsec aperture applying non-unity correction 
    factors to the geometrical aperture area ratios. A signal normalized to 
    the one in the 180 arcsec aperture is constructed which is the same as the
    flux ratio of both apertures. The normalized fluxes are written to the 
    header of the AAR product. In addition source and background signals are 
    written to the header of the SPD product. The aperture correction factors 
    for the background scaling have been hardcoded, no CalG file was 
    generated.

    ** Implementation into PIA done. To be found under Astrophysical 
    applications > Multi-aperture Photometry


11) Statistical flat-field correction for PHT-C raster maps

    If the extent of the PHT22 or PHT32 raster map exceeds 20 raster points 
    or plateaux, a statistical flat-field is determined from the ratio of the
    %10tile of the surface brightness of each pixel to the average %10tile for
    all pixels. These correction factors are applied to the PGAI products and
    are written to the product header.

    ** Percentile for the flat-field correction has been made selectable.



BUGS fixed:
-----------
There were no bugs reported to V9.1


******************************************************************************

PIA V9.1 - 09/01/2001 
========              

  
CONFIGURATION:
--------------

* PIA V9.1 is released in FOUR versions for running on top of IDL 5.0, 
  5.1/5.2, 5.3 and 5.4 respectively (the IDL5.4 release is the main reason for 
  this new version). 
  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 9.0 (versions HTML AND TEX) are completely valid
  for this version
  

PROCESSING:
-----------

* FCS measurements can be processed to AAP level also by batch/AOT automatic
  processing

BUGS fixed:
-----------

* setting and refreshing voltage saturation flag fixed

* sub-division in two pseudo-ramps fixed for all cases

* proper check of number of contours for contour map 

[First two bugs of this list were already fixed in the patch 9.0.1]




PIA V9.0 - 08/07/2000 
========              

  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 9.0 is in the HTML version available, together with
  the S/W package. 
  
  As soon as the TeX version is available, we will put it under the PIA 
  homepage.
 
  

I/O :
-----

* AAP data can now be saved into FITS format, with the option of combining any
number of measurements into one FITS file ("Super FITS"). The AAP variables to
be taken into the SuperFits files are defined by the user (see GUI). 


GRAPHICAL I/F:
--------------

* Under Buffer -> Astrophysical Work the new option for writing multiple
measurements FITS is reachable. This option open menu windows for choosing the
measurements to be taken and the variables which should be written into the
Super Fits file, as well as the filename. 

* An option for an individual measurement AAP Fitsfile is also under the AAP
main window, as well as under the AOT/Batch processing.


BUGS fixed:
-----------

* The PHT-S offset pointing interactive correction menu had a bug, which has
been fixed.  

* Bug by high ramp sub-division fixed.

* Problems with Zoom & Print and Select Area options in PHT-S Dynamic Response
  main window fixed.
 Window 


******************************************************************************

PIA V8.2 - 6/04/2000 
========              


CONFIGURATION:
--------------

* PIA V8.2 is released in three versions for running on top of IDL 5.0, 
  5.1/5.2 and 5.3 respectively. IDL5.2 is completely backwards compatible to
  IDL5.1 concerning savefiles with pre-compiled routines. Therefore the PIA 
  version for running on IDL5.1 is used in that case. PIA recognizes
  automatically which savefile has to be loaded. 
  
* For simplicity all versions are put under the same distribution tarfile. This
  makes it larger, but you get all the pre-compiled versions at one.
  
* We have decided to follow requests from many users and distribute also the 
  entire source code. This should help the users to develop own routines to be 
  used by the PIA system. 
  A WARNING: if you want to report on bugs, features, or whatever concerning
  PIA, please base them on observations done using PURE pre-compiled PIA as
  distributed. We do not accept reports based on PIA running with own compiled
  routines. 
  Another WARNING: in some cases the header of a routine has not been properly
  updated after a change. Do not expect a 100% matching. 
  
* This version is a pre PIA 9.0 version, as such it contains all the elements of
  the OLP 9.0 official pipeline (and will be used for validating it). 
  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 8.2 is in the HTML version available, together with
  the S/W package. 
  
  As soon as the TeX version is available, we will put it under the PIA 
  homepage.
 
  In the new manual there is a new section under the PHT-S dynamic
  calibration describing the PHT-S dynamic response method. Also there is a new
  chapter referring to the (new) PIA mapping simulation system.
  

PROCESSING:
-----------

* A mapping simulation system is released together with PIA 8.2. It allows the
  user to simulate sky (background + point/extended sources) and what the
  detectors PHT-C100 or PHT-C200 should have seen from it in any of the 
  different observation modes, including glitches and transient effects. The
  data derived can be ingested as normal measurements into PIA.
  
* The "dynamic response" method for processing PHT-S data is included. Developed
  within PIA, it makes possible to apply the corrections done in the
  "dynamic calibration" method in pipeline systems, like the PIA AOT/Batch
  processing and the official OLP.
  
* IMAP, a special tool developed at IPAC for cleaning P32 type data is
  integrated into PIA.
  
* An extension of the AAP level of reduction incorporates as further variables
  RA and DEC for every single point, including the chopper deflection and the
  pixel offset to the central position of the array. This includes a recognition
  of "old" saved AAP internal files and their proper conversion by reading in. 

* Photometry tables from AAP level quoting the apertures in arcseconds. Tables
  (Summary/Print files in TOP -> Buffers -> Astrophysical Work) in two different
  formats (Table format for easy export to eg Spreadsheets) in addition to the
  old (Text) format (thanks to B.Schulz). 

* Since this version is almost parallel to the OLP 9.0 release, it ONLY reads 
  OLP9.0 final AAR products, for their display. 
  If you want to access earlier final pipeline products, please use an earlier 
  version of PIA. 
     

GRAPHICAL I/F:
--------------

* A full GUI for the mapping simulation, which includes several parts eg for the
  sky definition, the AOT/raster parameters, timing parameters, access to the
  produced maps, etc.
 
* A full GUI for PHT-S dynamic response in place.
 
* AAP RA and DEC per individual signal added to the main AAP windows (RAP and
  DECP variables).

* Numbering of plots in main windows as "A", "B", "C" and "D", to avoid
  confusion with pixel numbering.
  
* Exit from main windows including the possibility of saving the changes into
  the buffer.
  
* Simulator reachable from top PIA window.
  
 

BUGS fixed:
-----------

* PHT-S offset pointing could not be disabled in the AOT/Batch procedure. Fixed.

* Bug in flags caused by ramp sub-division to 2 points per ramp fixed.

* Bug in Nx1 raster P32 case: it was assumed as nodding case. Fixed.

* PHT-SRD data from array detectors could not be saved into FITS files. Fixed.  


******************************************************************************

PIA V8.1 - 2/11/99 
========              


  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 8.1 is in the HTML version available, together with
  the S/W package. The TeX version should be updated soon by MPIA (specially 
  important, since the TeX version for PIA 8.0 was never delivered). 
  As soon as it is available, we will put it under the PIA homepage.
 
  In the new manual there is only one new section, describing the correction
  for PHT-S offset pointing.
  
  Please NOTE that if you want to send the whole new manual to the printer PIA
  provides you with an I/F under the Help button of the top menu. To get the
  actualized version you have to choose the option for html PS output, as long
  as the LaTeX version has not been updated.
  

PROCESSING:
-----------

* A correction for PHT-S offset pointing has been introduced. A few arcseconds
  off-centre positioning of a point source by PHT-S can lead to significant 
  changes, both in intensity and spectral shape. 
  
* New Spectral Response Function for PHT-S chopped measurements, including a 
  first order correction (as implemented in PIA 8.0, see bugs) is now taken as
  the default. Implemented also under AOT/Batch procedure.
   

GRAPHICAL I/F:
--------------

* GUI implementation of PHT-S offset pointing correction, with the possibility
  of editing the "true" object position, checking offsets, plotting correction, 
  comparing corrected vs uncorrected spectra.
  
* Possibility of activating / deactivating the dynamic calibration for PHT-S 
  chopped observations included in AOT/BATCH GUI.
  

BUGS fixing:
------------

* In PIA V8.0 it was not possible to use the new calibration method for PHT-S
  chopped measurements (which is now in PIA 8.1 the default choice) because of 
  a wrong named variable
  
* The main window on the SCP level did not show the deselected points correctly
  in some cases (although they were correctly processed)
  
* A pixel with no valid data by PHT-S on the SRD level led to a crash, when 
  trying to apply the dynamic calibration for PHT-S staring measurements

* Orbital dependent responsivity pro AOT could not be used (in PIA the default
  used is per measurement)
    

New/changed routines:
---------------------

load_calib_inuse.pro		select_dyncalib.pro	
pia_correct_s_offset.pro	pia_gencho.pro
pia_dis2aap.pro			correct_s_offset.pro
diff_yz_radec.pro		pia_dispaap.pro
diff_radec_yz.pro		pia.pro
pia_dispscp.pro			pia_dis2scp.pro
pia_proc_gen.pro		scp2aap_sl.pro
gen_choices_init.pro		default_response.pro
 

New calibration file:
----------------------

SL_footprint.sav (residing in CALSAVE directory)

****************************************************************************

PIA V8.0 - 25/08/99 
========              


CONFIGURATION:
--------------

* PIA 8.0 is configured in a way that only untaring the tarfile is necessary 
  by its installation. No edition of any file is therefore needed. 
  
* PIA 8.0 is also distributed as runtime library, so that users having only an
  IDL runtime license can run it.

  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 8.0 is in the HTML version available, together with
  the S/W package. The TeX version will be updated soon. It was not possible to 
  get it in line with this release, but it will take a couple of weeks longer.
  As soon as it is available, we will put it under the PIA homepage.
 
  In the new manual there are chapters describing the PHT-S dynamic
  calibration for staring and chopped modes and the associated GUIs. Several
  changes concerning mapping, signal linearization, treatment of chopped data
  found their way into the documentation.
  

PROCESSING:
-----------

* Signal linearization is fully implemented and MUST be used, since many
  calibration files depend on it.
  
* New (default) way of reducing chopped data, the "ramps pattern" analysis 
  implemented.
  
* Use of PSF factors for individual C100 and C200 pixels introduced. Possibility
  of flux extraction from maps using them implemented.

* New Spectral Response Function for chopped measurements established, including
  a first order correction.
  
* Filter to filter correction for PHT-P implemented in a more transparent way
  and parallel to PHT-C.

* New bitflag system in place. Making possible to recognize why data points are
  flagged, to reset them, to change the severity criteria.
  
* analysis of nodding observations including background subtraction implemented.

* faster processing (factor 3-5) reached through fundamental changes in the SRD
  derivation.
  
* possibility of flux calibrating FCS measurements added, thus, going beyond
  the SCP level obtaining the corresponding flux and brightness surface.

* new flatfield method (specially suited for mini-maps) introduced.

* saving a map in internal format leads to automatic saving of the corresponding
  uncertainty map. Reading a map includes reading corresponding uncertainty map
  if this is found.
  
* intrinsic noise calculations for maps with undefined uncertainties added. 
  Necessary for proper source flux uncertainty calculation by flux extraction
  from maps. Related to former point. If no uncertainty map is found, PIA makes
  an estimation of the general noise in the map by computing the median of the
  absolute differences between neighbour pixels.

* I/F to IRAF's Drizzling mapping method implemented.

* Re-initialization of calibration performed by change of CalG directory.
     
   
GRAPHICAL I/F:
--------------

* Access to decoded bitflags individually on all levels of reduction introduced.

* Upgrade of the mapping widgets: customization of aspect ratio of maps is now
  possible, flat-fielding methods GUI's separated for median filtering and
  background flat-fielding. 
  
* Large changes in the widget for AOT/Batch processing because of the changes in
  calibration and data processing for chopped measurements.
  
* Ramps reconstruction after deglitching as an extra feature implemented.

* Calibration info menues updated: Filter2filter + Point Spread Function

* Actual responsivity info window on SCP level added

 

New/changed routines (165 !):
---------------------
              aap_disc.pro              acc_volt.pro           acknowledge.pro
        assign_flag_db.pro          batch_dyncal.pro         biweight_mean.pro
    calib_choppmeas_sl.pro          calib_dynsrd.pro               ccalsrd.pro
    change_zplot_param.pro              choploss.pro               corrfcs.pro
               cp_disc.pro              cp_discl.pro           decode_flag.pro
        decode_piaflag.pro           def_version.pro            degl_ramps.pro
          deglitch_all.pro        deglitch_basic.pro       deglitch_change.pro
        deglitch_param.pro   deglitch_param_init.pro      do_corr_resetint.pro
           do_deglitch.pro            dyncal2aap.pro        encode_piaflag.pro
             firstq_ff.pro         firstq_ff_tmp.pro          fit_function.pro
             fit_ramps.pro       fitpar_str_init.pro           flag_define.pro
      gen_choices_init.pro           get_accvolt.pro       get_coordinates.pro
          get_headline.pro         get_map_noise.pro           get_rampend.pro
         get_rampsplit.pro           get_respons.pro            get_rodisc.pro
        get_rpchopstep.pro           get_scpdisc.pro           get_sigdisc.pro
           get_spddisc.pro           get_sysdate.pro         get_validflag.pro
             getoptpow.pro               give_cs.pro              glue_aap.pro
              ia_start.pro        mapaap2drizzle.pro          minimap_extr.pro
         pair_deglitch.pro        pcont_savefits.pro         pcont_saveint.pro
           pht_top_wid.pro                   pia.pro        pia_aap_bcksel.pro
          pia_anal_sig.pro        pia_base_drift.pro        pia_cal_crelin.pro
     pia_cal_flatfield.pro          pia_cal_ppsf.pro      pia_convert_iaap.pro
       pia_corrections.pro            pia_deconv.pro       pia_def_darkorb.pro
           pia_dis2aap.pro           pia_dis2erd.pro           pia_dis2scp.pro
           pia_dis2spd.pro           pia_dis2srd.pro   pia_disp_print_file.pro
           pia_dispaap.pro         pia_dispdrift.pro        pia_dispdyncal.pro
           pia_disperd.pro           pia_dispscp.pro           pia_dispspd.pro
           pia_dispsrd.pro      pia_drift_inipar.pro        pia_drizzle_if.pro
         pia_ff_backgr.pro  pia_ff_med_smooth.pro  pia_ff_med_smooth_param.pro
            pia_gencho.pro      pia_get_inbpower.pro        pia_get_strayl.pro
     pia_graph_extract.pro           pia_man_mea.pro    pia_map_operations.pro
        pia_map_rotate.pro            pia_mapaap.pro            pia_mapbin.pro
            pia_mapdef.pro           pia_mapdraw.pro              pia_mapw.pro
           pia_mktrans.pro        pia_multchoice.pro         pia_multi_aap.pro
         pia_multi_fit.pro         pia_open_iaap.pro          pia_pairdegl.pro
          pia_pairdegl.pro        pia_patt_defin.pro          pia_pickfile.pro
         pia_pickfile1.pro         pia_pixchoice.pro      pia_plot_spectra.pro
          pia_proc_gen.pro            pia_prtdef.pro          pia_read_ext.pro
           pia_respons.pro       pia_respons_abs.pro            pia_rodegl.pro
            pia_rodisc.pro           pia_scpdisc.pro     pia_select_pixels.pro
        pia_select_var.pro         pia_set_paths.pro        pia_set_sysvar.pro
           pia_sigdisc.pro           pia_spddisc.pro          pia_specphot.pro
         pia_spect_aar.pro           pia_welcome.pro             pia_xplot.pro
          pia_xsurface.pro          piaflag_info.pro              pickmeas.pro
          pickmeas_pos.pro            polar_if.pro  process_erd_to_pattern.pro
         process_pixel.pro           process_scp.pro        process_tmpsrd.pro
      ramp_2t_deglitch.pro         ramp_deglitch.pro         rds_flatfield.pro
          read_chebydb.pro        read_flatfield.pro         read_pc1omega.pro
         read_pc2omega.pro          read_ppomega.pro      read_specal_chop.pro
         rebuild_ramps.pro        rebuild_tmperd.pro             red_ramps.pro
              rlin_fct.pro             rlin_proc.pro            scp2aap_sl.pro
                sep_rp.pro           set_colours.pro         set_indsevere.pro
              spd_disc.pro            subtr_bckg.pro     subtr_darstr_meas.pro
          write_aap_sl.pro             write_scp.pro             write_spd.pro
             write_srd.pro           write_subtr.pro         writefits_mod.pro

 
New calibration files:
----------------------

PCPSF.FITS	PPPSF.FITS
PPFILTRAN.FITS	PCFILTRAN.FITS	PP3SLINR.FITS
PP2SLINR.FITS	PP1SLINR.FITS	PC2SLINR.FITS
PC1SLINR.FITS	PPFTOF.FITS
PC1CHOPSIG.FITS	PC2CHOPSIG.FITS	PP2CHOPSIG.FITS
PP3CHOPSIG.FITS	PP1CHOPSIG.FITS

Updated calibration files:
--------------------------

PC2RESP_02.FITS		PC2RESP_01.FITS		PC1RESP_01.FITS
PC1RESP_02.FITS		PPRESP_02.FITS		PPRESP_01.FITS
PP3FCSPOW_01.FITS	PC1FCSPOW_01.FITS	PC2FCSPOW_01.FITS	
PC2FCSPOW_02.FITS	PP3FCSPOW_02.FITS	PC1FCSPOW_02.FITS
PP2FCSPOW.FITS		PP1FCSPOW.FITS		PFLUXCONV.FITS
PSPECAL.FITS
PC1FLAT.FITS		PC1ILLUM_02.FITS	PC1ILLUM_01.FITS
PC2ILLUM_01.FITS	PC2ILLUM_02.FITS	PC2FLAT.FITS		
PP3FOOTP.FITS		PP2FOOTP.FITS		PC2FOOTP.FITS
PC1FOOTP.FITS		PC2OMEGA.FITS		PC1OMEGA.FITS



****************************************************************************

PIA V7.3 - 05/02/99 
========              


CONFIGURATION:
--------------

* PIA V7.3 is released in two versions for running on top of IDL 5.0 and 
  5.1/5.2 respectively. IDL5.2 is completely backwards compatible to
  IDL5.1 concerning savefiles with pre-compiled routines. Therefore the PIA 
  version for running on IDL5.1 is used in that case. PIA recognizes
  automatically which savefile has to be loaded. 
  
* PIA is now pre-compiled with the IDL RESOLVE_ALL feature, which means that all
  routines and functions coming from other libraries (eg Astrolib) are saved in
  the same file. Therefore the ASTROLIB has not necessarily to be attached to
  the IDL path for running PIA. 

  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual for 7.3 is in the HTML version available, together with
  the S/W package. The TeX version will be updated soon. It was not possible to 
  get it in line with this release, but it will take a couple of weeks longer.
  As soon as it is available, we will put it under the PIA homepage.
 
  In the new manual there is a new chapter describing the PHT-S dynamic
  calibration and its associated GUI and a strong updated chapter concerning
  mapping. Apart from these there are only small changes.  
  

PROCESSING:
-----------

* New mapping algorithms as alternative to the original one (see section 3.5.2.
  of the PIA Users Manual V7.3 "The PIA Mapping Software")

* PHT-S dynamic calibration as alternative to the standard reduction of PHT-S
  (see the new section 3.3.8 of the PIA Users Manual V7.3 "The PIA dynamic
  calibration method") 

* Change of the routines performing mapping deconvolution. Using now more robust
  and more sophisticated routines for max. Likelihood and max. Entropy.

* Automatic calculation of optimal map pixel sizes included.

* Dark current subtraction for PHT-S can be done according to the observing
  time.

* Signal linearization routines are part of PIA7.3, but only for internal use,
  until the calibration files affected by this correction have been updated.
  
   
GRAPHICAL I/F:
--------------

* A full GUI for PHT-S dynamic calibration in place.
 
* Mapping deconvolution parameters widget introduced.

* The mapping drawing widget has now been extended for choosing among the
  different mapping methods. Also a parameter for the new mapping algorithms, a
  "drop factor" is editable.   

* A general change concerning windows requiring immediate answer ("modal" type)
  had to be introduced. The old method (< IDL5.0) which was declared obsolete
  but has still worked under IDL5.0, gave bugs when using IDL5.1. Many of the
  updated routines in this version had to be changed accordingly. 
 
* An option for a correction "Signals linearization" is present in different
  I/F, but not active in the external version of PIA (you will get a warning and
  nothing else will happen), since it can be only used
  at the moment for calibration purposes (while we expect this correction to be
  active, and necessary, in a future PIA version). 

BUGS fixed:
-----------

* By the map deconvolution there was in version 7.2 an erroneous "convolved
  footprint", as an intermediate step to the "interpolated footprint". Fixed.
  
* Calibration measurements in chopped mode FCS1-FCS2 with FCS2 dark (no
  electrical power) could not be processed. Fixed.
  
* Maps with a smaller dimension than the footprint matrix could not be
  deconvolved. Fixed.
  
* In the patch 7.2.2 the batch processing with calibration measurements was
  leading to crashes, if the electrical power of the FCS was outside the "soft
  limits" due to a misinterpretation of a flag. Fixed. 


New/changed routines:
---------------------

acknowledge.pro		 assign_flag_db.pro		 assign_flux_db.pro
build_lotable.pro	 calib_dynsrd.pro		 change_tmphdr.pro
check_unc.pro		 combine_dynsrd.pro		 combine_dynsrd_pix.pro
darkcur_orb.pro		 darkcur_time.pro		 def_version.pro
deglitch_change.pro	 drift_mod_proc.pro		 dyncal2aap.pro
dyncal_clear.pro	 fill_dyncal.pro		 fitpar_str_init.pro
get_coordinates.pro	 get_headline.pro		 get_lotable_all.pro
get_ratsig.pro		 get_respons.pro		 get_sigupto.pro
ia_start.pro		 is_file_exist.pro		 load_calib_inuse.pro
pair_deglitch.pro	 phtacc_ratsig_init.pro		 phtdarkorb.pro
phtdyncal.pro		 phtdyncal_init.pro		 phtdyncaldb.pro
phtdyncaldb_init.pro	 pia.pro			 pia_aap_bcksel.pro
pia_anal_sig.pro	 pia_base_drift.pro		 pia_cal_crelin.pro
pia_cal_darkcur_proc.pro pia_cal_fcspow_proc.pro	 pia_cal_respons_proc.pro
pia_corrections.pro	 pia_deco_defin.pro		 pia_deconv.pro
pia_def_darkorb.pro	 pia_def_dyncal.pro		 pia_dis2aap.pro
pia_dis2erd.pro		 pia_dis2scp.pro		 pia_dis2scp.pro
pia_dis2spd.pro		 pia_dis2srd.pro		 pia_disp_calid.pro
pia_disp_print_file.pro	 pia_disp_stat.pro		 pia_dispaap.pro
pia_dispcust.pro	 pia_dispdrift.pro		 pia_dispdyncal.pro
pia_disperd.pro		 pia_dispscp.pro		 pia_dispspd.pro
pia_dispsrd.pro		 pia_drift_inipar.pro		 pia_drift_mod.pro
pia_ff_med_smooth.pro	 pia_ff_med_smooth_param.pro	 pia_gencho.pro
pia_get_inbpower.pro	 pia_get_strayl.pro		 pia_graph_extract.pro
pia_load_idyncal.pro	 pia_mapaap.pro			 pia_mapbin.pro
pia_mapdef.pro		 pia_mapdraw.pro		 pia_mapset.pro
pia_mapw.pro		 pia_multchoice.pro		 pia_multi_fit.pro
pia_on_line.pro		 pia_pairdegl.pro		 pia_pickfile.pro
pia_pickfile1.pro	 pia_pixchoice.pro		 pia_plot.pro
pia_plot_over.pro	 pia_presel_dyncal.pro		 pia_proc_gen.pro
pia_prtdef.pro		 pia_respons.pro		 pia_respons_abs.pro
pia_rodegl.pro		 pia_rodisc.pro			 pia_scpdisc.pro
pia_select_pixels.pro	 pia_select_var.pro		 pia_set_paths.pro
pia_set_sysvar.pro	 pia_sgratdisc.pro		 pia_sigdisc.pro
pia_sm_dis2smc.pro	 pia_sm_dispsmc.pro		 pia_sm_wavelet.pro
pia_spddisc.pro		 pia_welcome.pro		 pia_xplot.pro
pickmeas.pro		 pickmeas_pos.pro		 poly_cheby.pro
process_scp.pro		 process_spd.pro		 process_tmpsrd.pro
read_chebydb.pro	 read_darkorb.pro		 read_idyncal.pro
read_rlin_table.pro	 reduce_map_pos.pro		 rlin_fct.pro
rlin_proc.pro		 select_dyncalib.pro		 subtr_meas.pro
weight_mean.pro		 write_idyncal.pro		 write_map.pro
writefits_mod.pro							
 
New calibration files:
----------------------
Under PIA/calsave you will find all the new calibration files necessary for the
new PHT-S dynamic calibration. There are NO further updated calibration files in
this release.

******************************************************************************

PIA V7.2 - 14/07/98
========

Before coming to the changes, let me please ask you to use the "new" 
acknowledgement text in your publications, since the old one was misleading:
  "The ISOPHOT data presented in this paper was reduced using PIA, which is 
   a joint development by the ESA Astrophysics Division and the ISOPHOT
   Consortium". 
If you want to add the further old info, please add: 
   "(The ISOPHOT Consortium is led by the Max-Planck-Institute for Astronomy, 
     Heidelberg)"


And, PLEASE, use the reference given in the PIA homepage:

Gabriel, C., et al, (1997), "Proc. of the ADASS VI Conference", eds. G. Hunt &
H.E. Payne, pp. 108.

This is a small return for a big job, which was done for you.  


CONFIGURATION:
--------------

* PIA V7.2 is released in two versions for running on top of IDL 5.0 and 5.1
  respectively. This is imposed on us by the lack of backward compatibility for 
  pre-compiled routines by the 5.x IDL generation. It could bring us to freeze
  the IDL version used by PIA in the future. Please be aware of this when
  planning to upgrade IDL.
  
* PIA recognizes the IDL version you are running and searches for the file
  containing the corresponding pre-compiled PIA routines. 

  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual is now delivered together with the package in two
  versions: an html version, for accessing individual chapters or sections from
  help buttons within PIA and a LaTeX version in postscript format, which is 
  better suited for beginners and general consultation. The postscript output can
  be directly sent to the printer (PIA Top window -> Help -> Print user manual),
  with a configurable print line command. [Please note that new features 
  corresponding to V7.2 are not yet documented, a documentation upgrade should
  follow within the next weeks]
 

PROCESSING:
-----------

* Mapping deconvolution is implemented, using footprint matrices contained in
  FITS files delivered together with PIA. Maps using all detectors but P1 can be
  deconvolved using Max. Likelihood method and Max. Entropy method.

* Limitation of number of warning messages by re-assignation of chopper steps 
  due to telemetry drop-outs. 
  
* Responsivity uncertainties are taken always as a systematic error and 
  therefore not propagated.

* FCS measurements can be processed further to SPD/AAP level

* Possibility of using average responsivity by an FCS1/FCS2 chopped calibration
  measurement added.



GRAPHICAL I/F:
--------------

* A full GUI for mapping deconvolution has been created, which allows to 
  use different deconvolution methods, access the footprint matrices in their 
  full resolution and after interpolation to the map gridding size and display 
  the deconvolved images.
 
* Interface changed for sending the PIA Users Manual (LaTeX-Postscript version)
  to the printer, allowing the user to set the whole print command. 

* Responsivity method initialization changed to FCS1 as default. 

* Printer initialized to 8 Bits/Pixel. 

* Concatenated measurements are recognized as such by the GUI (info of every
  measurement used by concatenation written in the measurement's header).
  
   

Bugs fixed:
-----------

* PHT-S data failed in the processing SPD -> AAP level because of a (last 
  minute, sorry!!) small change done to a routine before the 7.1 release.
  Fixed.

* Bug by reset interval correction for a very special (not contempled) case 
  could lead to a PIA crash. Fixed.
  
* Change in the apertures values origin (made by 7.0 with the introduction of
  new calibration files) using different units was not followed by proper 
  changes in the mapping routines for PHT-P maps. Fixed.
  
* By this opportunity a better approximation has been introduced for circular
  apertures by the mapping algorithms for PHT-P. 
  
* A bug by P22 - mapping with the C detectors, when using a fixed raster 
  direction (PGA alternative not commonly used), was discovered (thanks to 
  Andrea Monetti's investigation) and fixed.    
  
* Bug for extremely large InstrumentTimeKeys (ITK) cases fixed.

* Bug for checking signal uncertainties by extremely long arrays fixed. 

* IDL bug fixed: Zoom&Print window was expanded (with empty space) 
  whenever a new overplot was done. 



List of new/updated routines:
-----------------------------
 
add_coordinates.pro     ibcksub_param_init.pro  pia_print_um.pro
check_step.pro          pair_deglitch.pro       pia_proc_gen.pro
corr_reset_int.pro      phtresact.pro           pia_prtdef.pro
darkcur_orb.pro         pia.pro                 pia_respons.pro
dec_admn.pro            pia_cal_footpr.pro      pia_spect_spd.pro
decode_admn.pro         pia_corr_vign.pro       pia_xplot.pro
decode_tdt2mea.pro      pia_curvefit.pro        pickmeas.pro
dffunct_info.pro        pia_deconv.pro          pixel_det.pro
do_corr_resetint.pro    pia_dis2erd.pro         process_scp.pro
drift_mod_proc.pro      pia_dis2scp.pro         process_spd.pro
fitpar_str_init.pro     pia_dis2srd.pro         process_tmperd.pro
fouksc_rtcho_drift.pro  pia_dispdrift.pro       process_tmpsrd.pro
fouksc_stcho_drift.pro  pia_dispscp.pro         read_footpr.pro
fouksc_ttcho_drift.pro  pia_dispsrd.pro         read_spd_sl.pro
function_2b_fitted.pro  pia_drift_mod.pro       set_common_drift.pro
get_cc.pro              pia_gencho.pro          set_driftpar_srd.pro
get_coordinates.pro     pia_mapaap.pro          subtr_meas.pro
get_nchoppsweep.pro     pia_mapbin.pro          write_iaap.pro
get_respons.pro         pia_mapdraw.pro         write_spd.pro
glue_aap.pro            pia_mapset.pro
ibcksub_param.pro       pia_mapw.pro


List of new/updated calibration files:
--------------------------------------

PC1FOOTP.FITS   PC2FOOTP.FITS   PP2FOOTP.FITS   PP3FOOTP.FITS


******************************************************************************

PIA V7.1 - 06/05/98
========


CONFIGURATION:
--------------

* PIA V7.1 includes a patch system, which allows for rapidly fixing the S/W
without a new release, in case this should be necessary.
For using a patch, a savefile containing the fixed routines has just to be
attached to the PIA root directory. 

  
HELP & DOCUMENTATION:
---------------------

* The PIA Users Manual has been proof-read while translated into LaTeX. Both
versions are now available and will be maintained in the future. While the 
html version is very helpful for online help, the LaTeX one is better suited
for beginners and general consultation.  

 
PROCESSING:
-----------

* Special package for Serendipity data handling again integrated within PIA.

* Only statistical uncertainties are now propagated. Systematic uncertainties
  corresponding to the reset interval correction, default responses use, 
  signal losses in chopped measurements correction and dark current subtraction
  are quoted into the headers of the measurements, for their appropriate use
  depending on the different analysis strategies applied in the data reduction.
  WARNING: the systematic uncertainties quoted in the headers are only 
  temptative and try to give the user an approximate idea about which could be 
  their influence on the derived values. The PHT Instrument Dedicated Team 
  is making large efforts to document this and give some receipts for the final
  error budgetting. 
  
* Warnings are issued in case of too few points for pair deglitching procedure,
  returning safely.
  
* Correction for signal losses due to the use of a chopped mode added on the 
  SPD and on the AAP levels.

* AOT/Batch processing switches automatically to the use of default responsivity
  if a chopped measurement is processed with background subtraction and chopper
  frequency correction. Corresponding indication is given in the processing log.

* phtaar and phtcs data can be also put from PIA into IDL main environment.

* FCS power tables checked for out of "soft" or out of "hard" limits. In latter
  case, use of default responsivity automatically switched in by AOT/Batch
  procedures. In both cases user is warned.
  
* PIA version used for data reduction is added to every measurement header

GRAPHICAL I/F:
--------------

* Internal files corresponding to a directory are sorted properly in the files 
  manager for reading them in a more convenient order into PIA.

* Individual setting of X-range in PIA_Xplot added.

* Output from PIA_Xplot to printer in colors (as on screen), if printer 
  customization accordingly (default printer initialisation is black/white 
  output).  

* Reversing B/W colour scale in maps (as required eg by A&A publications) is 
  now possible.
  
* Very large structures (> 32767 elements) can be also handled by the 
  structures handling widget (PIA_showstr).


Bugs fixed:
-----------

* No S/W crash if compact status info is not found in the buffers.

* Bug fixed for last ramp deglitching by 2 threshold deglitching.  

* Also bug fixed for last 2 pixels of PHT-S (they were not deglitched at all) by
  same deglitching procedure.
  
* Saving AAP level in FITS format was given wrongly as a possibility. Fixed.

* Bug for text output longer than 1000 lines fixed.

* Adobe prefix added to the a2ps text output (used only by Suns) to avoid 
  problems with certain printers not distinguishing postscript input.

* Inconsistency in common block for two sub-routines by the main drift
  modelling intermediate window removed.

* Bug for SPD data in handling data from the IDL main environment into the
  PIA buffers fixed.

* phtaar CB passed correctly to the buffer manager.

* Bug in corrections list menu by General AOT/Batch procedures fixed. (A wrong
  selection deactivation was the product of customizing the Signal Deglitching
  Procedure). 
  
* Bug in calculations for multi-filter/multi-aperture photometry in the cases 
  of pixels (C100/C200) explicitely disabled fixed
  
* The 2 threshold deglitching procedure was bad implemented within the second
  ERD main window.
  
* In case of FCS electrical power outside the validity limits a warning is
  issued. If this happens by the AOT/BATCH mode default responsivities are
  to be taken. This was not implemented for the case of two FCS measurements
  bracketing a source measurement. Fixed now.
  
* PIA contains a check against not defined raster point IDs. In a special
  case (only first data point not defined) this led to a S/W crash. It has
  been fixed now.
  
* The special AOT/BATCH mode for long raster maps contained a bug, which is now
  fixed.

* Default responsivity choice corrected for AOT/BATCH sequences corresponding
  to one TDT which contain more than 2 calibration measurements.
  
* Bug for reading AAR (pipeline) products corresponding to PHT-S rasters fixed.
 

******************************************************************************

PIA V7.0 - 20/02/98
========

As always, but specially in this case, the following list is not containing all
changes performed to PIA (the special case is given by the fact, that there are
173 new and changed files in the source) but only the most important ones. The 
updated User's Manual corresponds to this new version, giving more details.  


CONFIGURATION:
--------------

* PIA V7.0 runs only under IDL 5. This was decided in the first PIA Users Group
meeting, on the basis of the answers to a questionnaire sent to registered PIA
users several months ago. 

* PIA V7.0 does not support VMS anymore. This is also an outcome of the 
questionnaire mentioned above. 
  
  
HELP & DOCUMENTATION:
---------------------

* PIA's homepage (http://isowww.estec.esa.nl/manuals/PHT/pia/) mirrored at the 
national PHT-Data Center (http://www.mpia-hd.mpg.de/MPIA/Projects/ISO/index.html) 
at MPIA (allowing also for retrieving).

* Update of the PIA User's Manual (V7.0) is done and it is issued with
this version. We anticipate the issue of a LaTeX version of the manual also 
within few weeks.  

 
PROCESSING:
-----------


* Dark Current orbital dependences: have been established and put into new Cal G
  files (PPDARKC, PC1DARKC, PC2DARKC, PSLDARKC) which replace the obsolete 
  Cal G file PDARKCUR. In the new files the default dark currents are given in 
  bins of ISO orbital positions. Within PIA different interpolations can be used
  for subtracting dark current, per signal (or signal per chopper plateau), per
  raster point, per measurement or per AOT (default used by the Pipeline V7.0)

* Default Responsivities: by several detectors a dependence on the orbital position
  has been also found. New Cal G files for default response per detector have been 
  produced for P and C detectors (PPRESP, PC1RESP, PC2RESP), which replace the 
  obsolete file PRESPONS. PIA offers again here different interpolations, although
  limited to a value per measurement or per AOT (latter is pipeline default).

* The reset interval correction, implemented in PIA V6.4, but not reachable until
  now by the external version, is now fully operable. Furthermore, it should be 
  always applied, since all calibration files depending on this effect, have been 
  derived using this correction. 

* A chopper frequency correction has been implemented for background subtracted
  chopped measurements, which corrects for signal deficits caused by different
  chopping frequencies. The correction factors are taken from new Cal G files 
  (P#CHOPCOR, # being either 'P', or 'C1' or 'C2')

* A new deglitching processing has been implemented on the ERD levels, based on 
  a two thresholds algorithm. In addition to a higher efficiency it offers the 
  possibility of deglitching also short ramps, not possible with the old "Ramps
  deglitching". The use of the different deglitching methods can be alternative 
  or even complementary. (see also under Graphical I/O)

* New Cal G files containing the solid angles Omega per filter and aperture, 
  aperture dimensions, and pixel offsets relative to center of array for the 
  C detectors case have being implemented, following the first results of deep
  studies on beam profiles.
  
* Limits indicating the validity range of the FCS power tables have being added
  to the calibration files. These limits are used to issue a warning if a 
  responsivity is derived using an FCS measurement using an electrical power 
  lying outside the limits. Additionally, if this happens during AOT/BATCH
  processing, default responsivities are automatically taken and this is quoted
  to the user.     

* Sparse map handling - Raster map handling - Meas. sequence handling: The 
  production of maps out of sparse observations (but also out of any
  observations, not necessarily AOT-like connected ones) is implemented (see
  Graphical I/F). 

* PHT-S data can be also processed to maps, with the possibility of using data
  per pixel or per user defined wavelength region.
  
* Extended (and with better resolution) tables for color corrections assuming 
  1/nu or 1/nu^2 spectrae. The temperature region is now the same as for a 
  blackbody spectrum. All CC tables are now contained in FITS files, which are
  delivered together with PIA.  
   
* Checks for wrong raster point ID's (set to [0,0]) are performed and the values
  corrected while reducing data from ERD to SRD.

GRAPHICAL I/F:
--------------

* The new IDL5 feature of no blocking widgets is used, so that while PIA is 
  running, you have full access to IDL (from the IDL prompt) including to all 
  PIA buffers and routines. 

* The main I/F for general AOT ("batch") processing includes now the choices of 
  all the corrections desired behind choosable buttons (per level). All the 
  corrections which use variable parameters can be customized from the same I/F.
  
* Limits can be given for number of elements in plots and zoomed plots. This 
  allows for higher graphical speed. If this option is taken, a warning is 
  issued telling you that the plots you are looking at are not complete, unless
  such a warning is already present on the screen (or iconized, of course). 
  
* Main I/F's do exist now for the AAP level, controlling the access to all its
  variables, and including correction and processing for this level. Here is 
  the possibility given of concatenating measurements for producing eg sparse 
  maps or mosaicing. 
  
* Testing I/F for the new implemented "two threshold" algorithm for deglitching,
  including statistics recording in the same fashion as for the ramp
  deglitching.
   

I/O & Calibration Files:
------------------------

* A lot of new Cal G files required new read routines, new data areas for 
  maintaining this data (and changes in the routines handling with): 

	- P*RESP (orbital position dependent responsivities)
	- P*DARK (orbital position dependent dark currents)
	- P*CHOPCOR (corrections for chopper frequency dependent signal loses)
	- P*OMEGA (solid angles)
	- PCC_*  (colour correction tables [BB, 1/nu, 1/nu^2, PowerLaw])
	
  The P*RESP for P3, C100 and C200 contain a time dependance, due to application
  of recuring proceeding in the middle of the orbit from Rev. 150 on. 
  
 
Drift handling:
---------------

* New constants derived and implemented for P3, C100 and C200 "single
  exponential function"


Calibration menues:
-------------------

* New menues for accessing and visualising the orbital position dependent 
  default responses and dark currents.

* Menu for color correction tables changed according to extended corrections. 


Bugs fixed:
-----------

* Initialisation of triangular chopped mode for transients fitting. 
  


******************************************************************************

PIA V6.5 - 20/10/97
========

CONFIGURATION:
--------------

* PIA V6.5 produced for IDL5 also. It is a different file because IDL5 does not
  accept code compiled under earlier IDL versions. 
  
  IT HAS NOT YET BEEN THOROUGHLY TESTED concerning the graphical user interface,
  what we consider as a necessary step for validating the version completely, 
  due to the radical changes in IDL5 with respect to the earlier version. 
  However, concerning data reduction and files production it has been tested
  succesfully as every new PIA sub-version prior to release. 
  

HELP & DOCUMENTATION:
---------------------

* PIA's homepage (http://isowww.estec.esa.nl/manuals/PHT/pia/) extended 
  considerably.

* HTML lists of individual routines headers produced and available both from
  the homepage and from PIA itself.
  
 
PROCESSING:
-----------

* Corrected astronomical coordinates are used by default (as present in the IRPH
  files since OLP V6.1). Switch to use of uncorrected ones is possible (see
  graphical I/F).
  
* Better recognition of time drop-outs introduced. Steps and chopper positions
  checked against each other (see Bugs).   
  
* Color corrections applied also to medians and quartiles.

* Maps flat fielding for selected regions (i.e. background) implemented 
  (see Graph. I/F).

* Maps median filtering (and following flat fielding) + smoothing implemented
  (see Graph. I/F)
  
* Processing from SRD to SCP optimized.



GRAPHICAL I/F:
--------------

* Top window -> Customize allows for choice on astronomical coordinates to be
  used.

* Top window -> Customize allows for choice on error bars desactivation (valid
  then for all plots and zoomed plots).

* Full menu for maps median filtering, smoothing and flat fielding using the
  median filtering. It includes flat fielding using any defined region in the
  AAP distributions. Accessible for C100/C200 mapping from the main menu for 
  mapping.

* Graphical selection/deselection of several areas within distributions (ERD
  and SRD) added, deselected points are shown, also (de)selection by x range
  added.
  
* Enhancement of information in the Post-interactive drift handling main window.


* Inclusion of FITS files production on all levels included in the automatic 
  ("sequence") procedure (see known bugs).


I/O:
----

* Expansion for reading corrected astronomical coordinates, if present in the
  IRPH file.
  
* Reset interval correction files read from the corresponding Cal G files (only
  accessible from the internal version).

Drift handling:
---------------

* Initialisation of parameters globally made for chopped measurements.


Calibration menues:
-------------------

* Menu for color correction tables implemented

* PHT-S responsivities added to the corresponding calibration menu.

Bugs:
-----
* In the PIA V6.4 a bug was introduced affecting chopper positions in P32 maps 
  by the procedure for checking for telemetry dropouts. It has been fixed. 

* Wrong info written to the HDR concerning the discard of first NDR fixed.

* Individual selection of chopper plateaux fixed. 

* Same nomenclature used for SPD measurements read from pipeline SPD files or 
  PIA produced.
  

Calibration Files:
------------------

* PC2FLAT and PC1FLAT for C100/C200 flat fielding filter to filter 
  correction. (under "calg_not_off")

* P%%RESETI files for reset interval corrections (used only by internal version,
  under "calg_not_off")


Known Bugs:
-----------

* The SPD FITS files produced by PIA are not correct for raster observations 
  and contain repeated keywords in all cases, leading to warning messages. 


******************************************************************************

PIA V6.4 - 8-Jul-97
========


PROCESSING:
-----------

* A better check against telemetry dropouts affecting chopper step numbering is
  included

* Batch/AOT processing includes:
	- Sparse map handling (P17/18/19 & P37/38/39 modes)
	- Choice on automatic AOT mode recognition 
	- Choice on responsivity derivation: 
		- Single case: 'WIDGET', 'FCS1 use' or 'default responsivity'
		- Double case: 'Interpolation', 'Average' or 'Second meas'

* Origin of actual responsivity calculation information kept together with
  the actual value (see Graphical I/F)

* Information about the origin of responsivity used quoted within the header
  of measurement (on SPD or AAP level)   

* Baseline drift factors can be used for modelling long term responsivity
  changes affecting a measurement with several chopper plateaus and/or raster
  points. The factors are graphical derived (see Graph.I/F). 

* Color corrections: modified black body models with emissivity ~ nu and ~ nu^2
  added. Temperature ranges extended to 10 - 10000 K range.


GRAPHICAL I/F:
--------------

* Main plot routine (PIA_XPLOT) allows for individual setting of every y-axis
  range.
* Full menues for derivation of baseline drift factors, for correcting long 
  term responsivity changes within a measurement. Test processing menues also
  included.  
* Widget routine used PIA-wide for text saving/printing/displaying includes also
  the possibility of adding own written text.
* Several extensions in Batch/AOT processing GUI (see Processing changes)
* Mapping: chosen directory by internal/FITS files search used further as 
  default.
* All RPIDs setting to [1,1] possibility also on SRD level (eg for solar objects
  tracking mode) 
 

DRIFT HANDLING:
---------------

* Fixing bugs in initialization routines and pia_dispdrift. New modelling 
  function for FIR detectors included (combination of 3 exponential function) +
  new file with starting parameters (!CALG/offexp3_Adet_par.txt) 
  

CALIBRATION MENUES:
-------------------

* Access through a calibration menue (edit, plot, etc) to the actual 
  responsivities buffers. The menue gives access to related info, like 
  measurement used for resp calculation and filter used. 



BUGS:
-----
* Problem with measurement subtraction by 2nd SPD main window fixed. 
* Bug since 6.3 for BATCH/AOT sequence using RPID division fixed.
* Prevention for crash by FCS power search for a value outside the table.
* Printing values from PIA_XPLOT in the right order.
* Bug since 6.3 for writing maps in FITS format under ULTRIX fixed
(only this configuration was affected)


******************************************************************************

PIA V6.3 - 10/6/97
========


CONFIGURATION:
--------------

* The new PIA command looks at first for the existence of an individual pia_envi 
file residing on the start directory (shall be used for re-defining some system 
variables). See chapter "Installing and configuring the PIA system". 

PROCESSING:
-----------

* External flatfield corrections: have been defined for C100 and C200 arrays,
their values put into the CalG files PC1FLAT.FITS and PC2FLAT.FITS. 
(These files are going to reside in the "calg_not_off" PIA directory until the 
correction is also applied in the pipeline (V7.0). In order to maintain only 
one PIA version, dummy files containing unit values were produced and put into
the "calg" directory)


* Vignetting corrections: have been established for C100 and C200, their values
put into the CalG files PC1VIGN.FITS and PC2VIGN.FITS (residing on
"calg_not_off" PIA directory, same comment as for former point).

remember: - access to the values via calibration sequences -> Vignetting

* Reset interval correction: implemented. First correction to be applied on
SRD level. Should not be used in "normal" astronomical analysis at the moment, 
since none of the calibration files has been derived using this correction yet.
 
* Sequences: batch + AOT sequences unified. Reset interval + flat field 
corrections incorporated. Ramps subdivision for processing added (see 
ramps subdivision point on graphical I/F).

* Colour correction: implemented. (s. graphical I/F)

* Mapping using weighted means of fluxes contributing to an image pixel.

GRAPHICAL I/F:
--------------

* Buffer manager:
 - starts with the last configuration chosen within a PIA session
 - display the measurement chosen without asking if the same measurement is 
 several times in the buffer
 - it allows for assigning a user's chosen name to a measurement, displaying it
 (distinguishing between several versions of a measurement is then easier).
 Button labeled with "Baptize meas.". 
 - print button added for printing the list of measurements given in the 
 buffer's window
 - single measurements can now be removed from the buffer. When applying delete
 buffer the user is asked using the list of all meas present in the buffer.
 
* Deselection/Reselection of points by mouse possible for ERD and SRD level. 
Accessible under "graphical selection" by "test processing" on main ERD and SRD 
windows.

* Area selection by mouse on PIA_Xplot ("Zoom&Print") independent of direction.

* CAM images can be read from FITS files (in mapping: "Read FITS: CAM Type")
with full PIA map drawing capabilities [not intending to extend PIA towards CIA
but giving a fast way of checking CAM maps when analysing PHT data]

* EOHA, EOHI and OfflineReport (OLR) can be edited and printed from every main 
level window.

* Colour correction: For all choices on the astrophysical work except for
mapping and spectro-photometry, a menu for CC pops up asking if CC has to be
applied, which model has to be used (BB or power-law) and temperature or 
index to be used. Info about which CC factors have been used for correction to 
every filter is then given. 

* Top window: simplified and re-arranged. Hope is not confusing you. 

* Choosing measurement(s) from a list implies now that name and index are
taken (avoiding the question which measurement is desired if present several
times in the buffer). 

* Ramp subdivision: 
  - Choice on type of subdivision has been introduced: either directly the
number of read-outs per pseudo-ramp or pieces in which the ramp should be 
divided	
  - testing is included now in the main ERD windows, under
'Test processing' -> 'Fit ramps' -> 'Ramp subdivision'. As in other cases, the 
last accepted values for testing are taken by default afterwards. I leave 
asking for parameters on the interactive level, when using ramp subdivision, 
but when running an AOT/BATCH sequence the default values will be taken.  

* General upgrade of the menu for AOT/BATCH sequences. 

* Chosen plot symbol on a main level window (via customize) is kept as default.

* PIA_XPlot: added capability of producing ASCII tables from the plot / 
   multi-plots.


DRIFT HANDLING:
---------------

* better drift modelling initial parameters
* Fouks drift modelling for triangular and sawtooth chopped modes and 
  preliminary detector constants for P2 (all Fouks models) 
* preliminary starting parameters for C100 offset exponential function 
* discarding values also on time basis


I/O:
----

* Save internal files: 
 - now for every level from its main window full capability
   of saving into any directory under any name. 
 - if measurement to be saved from "buffers manager" several times present 
   in the buffer, the one showed by the mouse is directly taken (without
   asking the user).
 - measurements are correctly saved with all the corrections applied on the
   level to be saved and containing the correction info in the header.


* Read internal files: accept any name & understand associated compact status
file. If name different from official one, it will appear within quotes in the
buffers manager list (s. buffers manager improvement).


* Improved output system for photometry tables. 
Tables output for PHT-S changed and now more suitable for putting it into
spreadsheet system. 
Accessible from Buffers -> Astrophysical Work -> Summary/Print Values


* Removal of single records from the buffers possible.

* PIA_structures_help (to be used from the prompt) gives now also info on 
AAR structures.


Calibration menues:
-------------------

* access to the values via calibration sequences -> External flatfield
* read values from CalG through read_flatfield.pro


Serendipity:
------------

* Updated package SEM-2.02 installed


Bugs:
-----
* writing several times responsivities in HDR fixed
* if a measurement was several times on the same level in a buffer, 
"display header" showed the header of the first version of the measurement -
fixed
* background subtracted measurements contain all relevant header informations
* problem with pixel change in intermediate drift correction window fixed
* problem created by FITS directories containing the suffix FITS is fixed. No
limitations in the directory names. 
* Bug reading AAR products PPAS* and PCAS* fixed.
* Small shift in time when using ramp-subdivision fixed.


PIA V6.2 - Apr 14 
=========

Bugs fixed:

* C200 pixel order by default responsivities. Present only in V6.1
* Flags are not ignored anymore when performing signal deglitching  
(leading to problems when too many discarded points from another reasons and 
then the discarded points take the overhand over good points)


New features + extensions:

* extension of AOT general sequences and batch processing: 
  - SPD and AAP level can be saved, 
  - responsivity to be taken can be chosen automatically, avoiding
to give answer on PIA_respons window.

* all calibration menues are now accessible from all users, in order to
make possible to them to plot / edit calibration numbers. Checks on existence
of cumulated tables are made by the internal version to avoid crashes due to
their non-existence.

* measurements sequences info access (old orbital analysis) properly indicated
and documented.

* Maps are now produced without extensions containing empty rows and columns.
Rotation is (also partly because of this) now completely correct. Different
options for interpolation built into the GUI.

* Maps FITS writing now properly implemented. Reading maps from the pipeline
(including internal correction of keyword bug in actual pipeline product) 
working also properly.    

* All signals per ramp get uncertainties assigned (using statistical methods)
in order to avoid problems (e.g. divisions by zero). Also pseudo-ramps with
less than 1/2 of the required read-outs (e.g. because of discarded reads) get 
flagged as "with non reliable uncertainty" and their uncertainties are 
re-calculated. The effect observed was that pseudo-ramps with very few reads
got very high weights by the weighted means, dominating these. We try to 
prevent for this now.

* upgrade of P05/P25 automatic sequence: if no straylight meas. present (or
used) then dark current meas. is used for dark current subtraction from FCS
measurement. 

* Housekeeping data can be accessed also on a per TDT basis (in addition to
per measurement) on the ERD level. 

* Upgrades info now accessible from HELP main button, containing all the 
relevant parts of the mails announcing new PIA versions (as this one).




PIA V6.1 - Mar 10 16:06:36 1997
========

This release includes several new 
features and also a different way of starting PIA, more user friendly, and with
less work on the user's side, whenever new things should be defined.

	Let me start with the second point:
- PIA is now started just by a command pia (or PIA) which should be defined
systemwide. This command starts a cshell script (UNIX) / DCL command file (VMS) 
located on the main PIA directory
without any need on the user's side neither for defining variables nor for 
copying files. The directory from which you start PIA is used as default for
all the locations needed (e.g. data repository, save and print directory). 
You can change of course via the graphical I/F all these definitions after 
having started.

- If you wish to define from the very beginning the (user defined) locations 
you can copy from the main PIA directory a file pia_envi (unix)/ pia_logdef.com
(VMS) to a directory of your own and modify accordingly. By default PIA will 
look for the existence of such a file under a directory 'pia' directly below
your root directory (e.g. ~aeinstein/pia/pia_envi or 
[AEINSTEIN.PIA]pia_logdef.com). If you want to have this file on a different
place please define an environment variable/logical variable PIA_LOC_IND 
pointing to your chosen directory.

Now, to the first (and more important) point:

*) V6.1 has as a main new feature the possibility of fitting transients to the 
signals in a more (much more!) fancy way: you will find a complete description
on the PIA User Manual, included in the package. There is the possibility now
of accessing interactively all results achieved in the drift modelling for
inspection, reprocessing, acceptance or rejection. Also fitting is much more 
reliable by the use of a two steps fitting algorithm, which combines the 
AMOEBA technique (with SIMPLEX) and the Hessian derivative method. 

*) The text output sent to the printer on UNIX is now always in postscript 
format.

*) deglitching on the signal level is now less strict (same as in PHT pipeline). 

*) Documentation has been updated in several chapters.

In addition a couple of minor bugs were fixed, mainly dealing with drifts 
fitting.

	I have added to the version 6.1 the new serendipity data analysis part,
which I got from MPIA (Heidelberg)/ AIP (Postdam). 


PIA V6.0 - Feb  6 15:11:31 1997
========

- New corrections coming from new calibration files:

  * The FCS flat field matrix ("FCS illumination matrix") is now filter 
dependant. It is now also time dependant and governed by the PTIMEDEP cal G
file. 

  * The PSF factors for the detector arrays C100 & C200 are now referring to
the whole array and not to the individual pixels: the consequence is that fluxes
on the AAP level per pixel are not PSF corrected, which was supposed to be 
anyway correct only for the C100 central pixel. The correction is done when 
applying multi-filter, multi-aperture photometry, or summary/print values on 
the astrophysical applications level. 
(Discarding pixels is possible, up to 2 pixels, with the exception of the 
central C100 pixel: the PSF corrected flux for the whole array is then 
constructed using for the discarded pixels mean values of corresponding pixels, 
distinguishing between side and corner pixels for C100)

 * Filters' central wavelengths are taken now from a cal G file. 
They had been redefined and are slightly different to the "real" central 
wavelengths for better comparison to other experiments.

* Calibration of PHT-S is done using point source spectral response (as 
until now) and extended source spectral response (new) to derive Jy and 
MJy/sr respectively. 


- Improvements in the processing / fixing bugs: 

* A bug in the conversion of UTST (time of performance of observation = 
seconds after 1989, present in the Compact Status) to normal universal time 
has been fixed. The date of observation stored with any PIA product in the past 
is wrong (but it is not used in any part of the processing).

* Bug on PIA FITS files reading (SRD and SCP level) has been fixed. Upgrade
for finding corresponding CS files.

* SPD measurements in the buffer manager contain all the info as for other 
levels.





PIA V5.5 - 20-DEC-1996
========

* P05/P25 analysis: as you probably know, the new P05/P25 AOT logic includes the 
possibility of performing a straylight measurement and a dark current 
measurement in addition to the source and the FCS measurements (both staring 
now) for the same filter.

PIA offers:
 - on the interactive level: straylight measurement subtraction (to the FCS 
measurement, active on the SCP main window if the active measurement is of FCS 
type), and dark current measurement subtraction (same window, both for source 
measurements AND FCS meas. possible). If one of both is subtracted the results 
are accomodated in the same buffer place, and the subtraction is quoted in the 
header, in order that the user cannot apply a dark current subtraction in 
addition, by mistake. 
 - on the sequence level: the choice of P05/P25 mode, from every level of 
reduction, including from the ERD FITS file level. PIA recognizes the 
measurements as they are and perform a straylight subtraction and a dark current 
subtraction using the corresponding measurements, if they are present. You can 
of course give a different sequence (when using measurements in the buffer) for 
testing it without straylight or dark current or both measurements performed.

* A new system of determining drift behaviour has been introduced, based on the 
variation of signals in different intervalls ([2^(n-1),2^n] seconds). This is 
meant to help determining how far the signal drifts could vary. At the moment is 
mainly used to help us (the PIDT) to determine drifts behaviours and time 
constants.

* A system of internal dynamical buffers was introduced for all results coming 
from drift stability, drift modelling and the new analysis on slopes variation. 
At every time of a session statistical information about the different analysis 
can be recalled, from the SCP main window, VIEW button, ' Statistics on ...'
 
* Stability analysis: it has also been upgraded resulting in a considerable 
analyis performance speed-up. 

* All the different analysis can be applied now to every kind of raster/chopper 
combination. The graphical I/F has been changed a little bit for making things 
more simple in this case.

* Deriving signals per chopper plateau from single signals has been also 
considerably improved. Important mainly for long P32 maps (could bring up to a 
factor of 50 in speed!).

* I/O routines for calibration files containing C200 pixels information have 
been changed for new Cal G files: C200 pixel order has been changed to the 
convention adopted by the PHT-SPD pipeline level. WARNING: This means, you 
should use the new calibration files, which are contained in the CALG and 
CALG_NOT_OFF directories coming together with the PIA V5.5. 

* More astringent handling of uncertainties for the weighting means have been 
defined: in case of an uncertainty, which is less than 1/1000. of the 
corresponding value, it is automatically set to the mean of the corresponding 
uncertainties distribution. This is to avoid that single (too small) 
uncertainties dominate the weighted mean calculations.

* Batch processing (recommended when having a lot of FITS files to be processed) 
has been extended to the AAP level.

A couple of minor bugs have been fixed:
- central wavelenghts for the C detectors on AAP level have been corrected 
(important for multi-filter analysis)
- headers handling in case of automatic AOT sequences for several FITS files has 
been corrected.




PIA V5.4 - 3-DEC-1996
========

 Some bugs:
 ==========
* CRE linearisation: Bug for P2 and P3 case fixed (a very small effect!)
* PHT P apertures: old values were used. Measureable for very small apertures vy 
      responsivity calculations (up to 20%). Fixed.
* Bugs in writing FITS files from SCP and SPD level fixed.
* Cal A files from pipeline now correctly read in.

 Improvements:
 ============

* All AAP/AAR products contain the central wavelengths of the filters, instead 
of the nominal ones.

* Ramps subdivision: now it is possible to define any number of read-outs (less 
than the one really used per ramp integration) for obtaining pseudo ramps. In 
case of long and few ramps can be an improvement for using gaussian statistics 
without stomach pain. Full processing can be performed using the pseudo-ramps

* Linear interpolation of two FCS measurements can be performed also from the 
SCP main window (until now only on the automatic sequences possible). 
Recommended for mapping observations with two FCS's. 

* Weighted means can be disabled. Button on main customize window. If applied 
all means (e.g. signals per chopper plateau) are taken without weighting with 
the uncertainties.
--> connected with this: checks for uncertainties are automatically done, in 
order to avoid overweighting single signals with small uncertainties. A 
threshold is set in the uncertainty, which can not be lower than 3 sigmas away 
from the main uncertainty (working only if at least 15 points present in the 
distribution).

* Signals deglitching: is now possible also on individual chopper plateaux 
instead of using the full chopper step. Controlled from test window.

* A lot of changes in drift modelling (mainly concerning our investigations at 
the moment, for internal use of the PIDT).

* Mapping: printing maps is now working properly. Problems with color table 
fixed.





PIA V5.3 - 14-NOV-1996
========

I skipped V5.1 and 5.2 from the 
general releases because they were just internal versions, but since they have 
been used long time by the IDT I prefer to call this one V5.3.

	It contains a couple of changes which affect the general users: the main 
one is the use of time dependant calibration G files. There are at the moment 
two types, you will access them automatically from both CALG and CALG_not_off 
directories, depending of the time your observation was performed. 

	Serendipity mode is now being added to the package. 

	Several changes concerning drift modelling were applied, but this has 
only a meaning for people investigating drifts. I have now taken out some 
options in the drift modelling for external users, until we know better about 
the function parameters to be used.

	In addition a couple of small bugs were fixed, like flat-fielding for 
simple maps, aap buffer could not be deleted, etc. 



PIA V5.0 - 16-SEP-1996 
========

* In addition to a lot of 
effort done for updating documentation on several corners, fixed a lot of minor 
bugs, make possible reading / accessing all pipeline products, ... , it contains 
as a major new feature the possibility of fitting signal transients. Several 
functions are offered, and you can change function, initial parameters, 
parameters to be taken fix or variable, etc, by a case sensitive graphical I/F. 


PIA V4.9.5 - 26-JUL-1996
==========
* Calibration files: they are updated now. 

* Graphics: 
  - all the main windows are now looking similar (also a little bit smaller to 
cope with monitors with less resolution). 
  - better access (one widget) to the system variables 
  - returning to PIA colours working properly
  - several upgrades in buffers manager (giving info on subtracted measurements, 
etc).

* Processing:
  - Dark Current subtraction to FCS measurements done automatically only at the 
time of calculating Responsivities.
  - Bug with Response widget fixed (took always averages despite of choice 
'averages or medians')
  - Saturation point set default to 1.0 Volts.  
  - Background subtraction (for chopped measurements) done in the batch/general 
AOT processing and subtracted measurement added to the measurements buffers to 
further reduction. 
  - No info-windows popping up by batch/general processing.

* I/O:
 - writing header files at the right place & respons files include by default 
the measurement name.
 - AAP measurements can be stored and read back into the buffers.
 
* Mapping:
 - maps can be rotated to any angle wrt RA-DEC plane, after having being 
produced.  

* Documentation:
 - The PIA User Manual is now 'complete' and revised. Proof-reading of the last 
60 % will be done in the near future. 
 - User manual access using Xmosaic under VMS works now perfectly.
 - The user manual can be sent to the printer at once from the top window. The 
PIA includes now a complete postscript version (actually 31 postscript files and 
a script/command file to send them to the printer in the right order, including 
a cover page). Please be careful, there are almost 200 pages. 

* Advanced use of the PIA:
  - routines do exist for accessing easily the buffers and refilling them, thus 
IDL own work on the data is now much easier. Also completely documented in a new 
chapter of the User Manual.

and, as usual, a couple of small changes to make individuals happy ...


PIA V4.9.3 - 28-JUN-1996
==========

I have just released a new PIA sub-version. It contains a couple of new 
features and also some minor bugs were removed. For general users (those not 
working on calibration) the main changes have been done in the mapping sector. 
Convolution of maps/scans to other wavelenght's resolutions have been 
introduced, profiles plotting is now possible. 


PIA V4.9.2 - 7-JUN-1996
==========

1) the deglitching algorithm on signal level was not working properly for raster 
mode. Mainly affecting P32 measurements and probably very slightly. 
Nevertheless, please check your P32 analysed data, or reduce it from SRD level 
on, again. 

2) a bug (only in V 4.9.1, not before!) was fixed, which made impossible to 
process maps by separating per raster point and rearranging on SCP level. 

3) Show Header problem on files manager fixed.

4) 1st NDR can be deselected also if not according to general criteria in Cal G 
file, and this option active.

5-...) a lot of help buttons (probably all? please tell me if you find one which 
is not working) are now pointing to the corresponding hypertext help file. As 
further option instead of going over the entirely user manual.


PIA V4.9.1 - 27-MAY-1996
==========

* due to small bugs on the graphical I/F (rapidly fixed), I have delivered 
a new sub-version


PIA V4.9 - 24-MAY-1996
========

* the files and buffers control is now separated into files control and buffers 
control. They are easier to be handled and have incorporated a lot of new 
things. Please get a look and judge yourself.

* The appearance of a lot (and I mean a lot!) of windows have improved. We try 
to help all newcomers.



PIA V4.8 - 10-MAY-1996
========

* Graphical I/F: a lot, since while preparing the documentation for the V5.0, 
coming out end of May, we have tried to be at most new-user-friendly as we can, 
given the schedule. You will perceive several changes in names of things, e.g. 
'Files' is not more used for 'Measurements', 'Zoom' is replaced by 'PIA_Xplot', 
the top widget should be most specific and better items separated, etc. 

Concerning special window: 
- the files&buffers manager is now given info on measurements, which are 
important for not having to remember always the TDT numbers. 
- the Cal A files are displayed correctly on the SCP level.

* Processing:
- very large maps can be processed now (I am talking about measurements over 2 
hours of exposure, but of course not limited to this). There is a button in the 
sequences which takes 1 ERD meas. in the buffer (has to be read in first), 
separate it per RP (the test meas. had 456 raster points), process all the meas. 
to SCP and put them together, deleting everything which is produced during this 
process, apart from the last one, of course (necessary, example occupies ~300 MB 
memory otherwise). Mapping works also after this.

- Mapping: new roll angle definition is handled correctly, now. 

	   flat fielding is working properly

- Bugs fixed: several, main one was subtraction from other measurement. Others 
were small bugs concerning buttons not working properly, etc.


* calibration: several new things in the menues, but this is PIDT internal.   



PIA V4.7.1 - 25-APR-1996
==========

* It seems I have discovered with the version 4.7 how to kill a machine 
with a simple IDL routine (which acts just in some cases, and not in my testing, 
of course). Please do not use this version for PHT-S data.


PIA V4.7 - 24-APR-1996 
========

* Straylight subtraction: a new menu for subtracting 
straylight from FCS measurements. It offers you all the 
measurements done with the same TDT on the SCP level. 
You should choose the immediately before if the FCS is 
the last one in an AOT or the immediately after if the 
FCS is the first one in a sequence (like in mapping). It 
starts with 4%+/-2% as straylight level (as our 
calibrators told to me to be the approximate level). You 
can change it. At least it should help you in judging 
which could be the effect introduced by straylight on 
your responsivity calculation (it is a very difficult 
matter for calibration!)

* Multi-filter, -aperture, -etc: Now you have an 
independent choice for C200 and C100 pixels you want to 
use. (And the bug when combining detectors is fixed). 
The final numbers you get (I was asked) are the sum of 
all pixels used.

* Buffer & Files manager: working properly now.

* Reading AA products from the pipeline is now 
implemented for all products. (just for maps you use the 
old way from the mapping S/W). After reading them header 
and structure containing all elements come up 
automatically in two menues.   

* Logging of Deglitching and Linearity correction in the 
corresponding headers is now working properly. Also if 
applying linearity correction after deglitching you get 
a warning. The other way around is correct!

* Serendipity files now correctly handled.

* Spectra are produced also in F_lambda (more commonly 
used vs lambda than the F_nu in Jy)

* Your plots from the zoom windows get date and user in 
the bottom, for a better documentation on your side.

* Flux conversion values (W-> Jy) and Spectral responses 
(V/s -> Jy) are now taken from the new official Cal G 
files. The same applies for the PHT-S wavelenghts.

* Measurement subtraction normalizes with the aperture 
of both measurements used.


PIA V4.6.1 - 12-APR-1996
==========

* Bug in flux calculations for PHT-S fixed!  The conversion from V/s to Watts 
and Jy / Mjy/sr was wrong. Choosing default responsivities for the conversion 
had a bug, and choosing the actual responsivities (in case of PHT-S they should 
be the same for the time being) led to a S/W crash. Now both are working and do 
the same. 
(I am very sorry for this, probably the proximity of my holidays was the reason)

* On the SPD level is it now possible to plot/overplot flux spectra and surface 
brightness spectra after having done the flux calculations. 

* On the Astrophysical Work level is it also possible from a plot button.

* Mapping is now working properly using the astronomical coordinates.

* Writing FITS files from the PIA is now directing the files to the SAVE 
directory and not to the working one. 

* Problem with FCS cross calibration menu fixed and now working properly. 
General FCS calibration menues upgraded, use of an external table as FCS power 
table introduced as choice.


PIA V4.6 - 27-MAR-1996
========
 * New derivation of flux (Jy) and surface brightness (MJy/sr): Using the new 
cookbook constants established by our calibration team. Specially for PHT-S the 
approach is totally different from the old one. The values for PHT-S calibration 
used now by the S/W are not yet approved officially but close to what we are 
going to release. 

* The widget for showing data structures includes the possibility of seeing one 
variable for all the records.

* Two bugs fixed (affecting internal files reading and PHT-S wavelength setting)


PIA V4.5 - 13-MAR-1996
========
* A buffer and files manager has been incorporated. It allows to control at any 
time into the buffers and directories chosen, to select files or measurements, 
etc. We keep this as an extra option, for people who are not disturbed by such 
large (background) windows, on top of which other windows are coming. It should 
be specially nice for newcomers, to have a better overview.

* Improved mapping routines: 
- The case of mapping using the actual coordinates has been corrected. It 
displays ALWAYS with RA,DEC coordinates rotated to match the y,z spacecraft 
direction.
- Output -> FITS files is implemented.
- Source search within maps works now correctly. 
- Flat fielding has been optimized.

* The widgets for 3-dimensional (PIA_Xsurface) display use now the same printer 
definitions as the mapping routines and the Zoom window, allowing for scaling, 
different type of outputs, size definitions, etc. 






