The following parameters must be entered for each observation within an AOT CAMO4:

• BEAM : selects the channel (SW or LW), but also the large or the small Fabry mirror (small one recommended with PFOV = 1.5 arcsec and in some cases with PFOV = 3 arcsec, see section ):

  BEAM = SW-l SW channel + large Fabry mirror.
  BEAM = SW-s SW channel + small Fabry mirror.
  BEAM = LW-l LW channel + large Fabry mirror.
  BEAM = LW-s LW channel + small Fabry mirror.

• PFOV = 1.5, 3, 6 or 12 (arc sec.).
• CVF_START = _begin = (in microns) the wavelength of the beginning of the range to scan.
• CVF_STOP= _end = (in microns) the wavelength of the end of the scan.

Note also that if CVF_START and CVF_STOP are not taken in the second column of Table to , the system will automatically set the wheel to the closest achievable value of .

• CVF_INCR = = number of steps between two wavelength points of the scan .
• T_INT = in second, the elementary exposure time:

  SW : 0.28, 2, 6, 20, 60.
  LW : 0.28, 2, 5, 10, 20.

• ADC_GAIN = electronic gain of the amplifier:

  2, SW channel.
  1, 2 or 4, LW channel.

• ORDER_CVF : a sequence containing 1 to 3 of the following commands of OPERATIONS, the order in the sequence is the Observer's choice:

  OBS = request of the observation in the selected configuration, on a single pointing or the complete raster.
  DARK = request for a dark frame measurement.
  CLEAN = request for a CLEAN procedure.
  OBS is obviously mandatory, the two others are optional. CAL is not available in CAM04. The flat-field will automatically be taken in a library. CLEAN has no effect for SW.

  A Dark frame is mandatory for processing each observation. If for an observation they are not produced by an OPERATION, the system will first scan the list of observations of the AOT looking for these frames generated with the same , if they are not found, a library frame will be used automatically.

• PROC_DRK : if DRK is requested, the observer specifies the number of the selected procedure for the DRK OPERATION (see Tables and , in section ).
• PROC_CLN : if observing with the LW detector, the observer can ask for a clean procedure to be applied (see section ).
• N_EXP_CVF = = number of exposures needed to attain the required S/N ratio at each step of the scan.
• N_STAB = = number of stabilization exposures applied before starting the scan.