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This window is the switchboard of the P32Tools package. The top panel gives
the characteristic parameters of the measurement. The 'SHOW' panel provides
quick-look access to various maps and measurement details.
The 'DRIFT processing' panel contains the global parameters for the
drift fitting routines. Finally, the bottom panel deals with executing
the drift fitting, inspecting and saving results as well as exporting
the processed data back to PIA.
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Characteristic parameters of the selected measurement are displayed: |
 
This panel combines the different options to quickly
examine satellite or
instrument specific data of the map and to visually inspect map
results.
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Pixel Map
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Shows contour plots of the P32 maps created from the signals of each
individual detector pixel. The units along the axis of the map are
arc sec.
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Grid
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Shows the data sampling during the observation. The individual positions
of pixel 1 during the whole observation are marked on a grid. The
horizontal axis corresponds to the y-axis of the spacecraft. The vertical
axis corresponds to the z-axis of the spacecraft. The units along the
axis of the chart are arc sec.
The observation starts in the upper right corner and continues to the left
and downwards.
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Header
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Displays the fits header of the observation. The header mainly contains
information on satellite parameters and on planning logistics. For a
detailed description see the ISOPHOT Handbook.
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Com. Status
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Displays the compact status file (PSTA file) of the
observation. This file contains a summary of the measurements
in an observation. For a detailed description of the parameters
contained in this file, see the ISOPHOT Handbook.
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Map DISPLAY Options
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Launches a new window which allows to select the map units,
flat fielding and the treatment of the slew data.
(See Section 3 .)
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DISPLAY_MAP
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Display the current map. The parameters selected in
'Map DISPLAY Options' will be used. The same interface as
in PIA Astrophysical Work will appear.
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This panel controls the influence of the uncertainties on the drift fitting.
It determines how the data taken during slewing is handled and how many
times various parts of the drift fitting are iterated. It also allows
saving and restoring of the drift fitting parameters for the whole
detector array.
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Measurement errors
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Adopts the statistical errors for the erd2map process as they are for
the drift correction process, i.e. the most unrealistic error.
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Responsivity scaling
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Multiplies the statistical errors of the erd2map process with
the same correction factors as the data itself.
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Internal dispersion (default option) |
Independent photometry estimates are derived for each sky sample and the
dispersion of the flux values is adopted as error.
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Flux step dispersion
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Independent photometry estimates are derived for each sky sample and
the dispersion of the flux values is adopted as error taking into account
the flux steps before each sky sampling. I.e. flux samples with a
preceding big flux step will be weighted less. This suppresses
possible ghosts of bright sources in the final map.
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The P32Tools package provides three different ways of treating the data
taken during the slewing of the satellite from one raster point to another:
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Excluded
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The slews are not considered at all for the drift fitting.
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Coadded
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Data of one slew are coadded into one data point per chopper plateau
of that data. The data points are then merged with the other to provide
an uninterrupted flux history.
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Sequence (default option)
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All slew data are used independently.
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During the drift fitting process, various steps are iterated. First, the iteration of the starting conditions, since the initial illumination level has to be determined by 'sophisticated' guessing. Second, major iterations, to establish the overall illumination history and the drift fitting of the actual data. |
# of Iterations for Start
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Number of iterations to determine the starting conditions for the
drift fitting.
Recommended for C100 : 1, for C200 : 2. |
# of Major Iterations
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Number of Iterations for drift fitting algorithm.
Recommended for C100 : 1, for C200 : 2. |
 
For each pixel there is a set of 12 parameters that controls the
fit of the drift behaviour. The whole parameter set for all detector
pixels is handled by the associated line of buttons.
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SAVE_TO_FILE
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Saves the drift fitting parameter set to a file with the filename suggested
in the popping-up file selection interface, which can be changed.
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LOAD_FROM_FILE
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Loads the drift fitting parameter set from a file with the filename specified
in the popping-up file selection interface.
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RESET_TO_DEFAULT
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Resets the drift fitting parameters to the default values.
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CALCULATE_ON_ALL_   PIXELS |
Calculates the drift model for all individual pixels.
This can take a very long time for a big map! This is generally
the first step before working on individual pixels.
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INSPECT_SINGLE_   PIXELS |
Opens a new window to access and improve the fitting parameters of the
single pixels and to display, deglitch and analyze the data per pixel
in detail, see Section 4 (Inspect Single
Pixel).
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SAVE / RESTORE
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Saves a dataset to a specified filename or restores a selected dataset from disk.
The saving does not include the drift fitting parameters for this solution! When
restoring a dataset, it must coincide with the currently processed measurement to
achieve a correct initialization of the buffers.
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EXPORT_RESULTS_TO_   SCP_LEVEL |
Exports the drift corrected data to the SCP buffer of PIA for further data
processing therein, i.e. calibration, astrophysical work, etc.
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DISPLAY_MAP
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Displays the map applying the current drift model. The parameters selected
in Section 3 (Map DISPLAY Options) will be used.
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Close      
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Closes P32Tools, discarding all internal buffers of P32Tools.
CAUTION: Make sure that you have saved your (intermediate) results since they will be lost otherwise. |
Help
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Displays the help file for this window.
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