The following parameters must be entered for each polarization observation:

• 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.).
• FLTR_CVF: selection of a Filter or of a CVF segment:

  FLTR_CVF = 1 to 11 selects a filter in channel SW.
  FLTR_CVF = 14 selects CVFSW in channel SW.
  FLTR_CVF = 1 to 10 selects a filter in channel LW.
  FLTR_CVF =11 or 12 selects CVFLW1 or CVFLW2 in channel LW.

• CVF_LAMB = the requested central wavelength (in micron) of the selected CVF segment:

  2.273 5.122 for FLTR_CVF = 14 (SW).
  4.956 9.583 for FLTR_CVF = 11 (LW).
  9.003 16.52 for FLTR_CVF = 12 (LW).

  Note that if CVF_LAMB was not taken in the second column of Table to , the system will automatically set the wheel to the closest achievable value of .

• 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 : a sequence containing 1 to 4 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
  CAL = request for a calibration with the ICD.
  DARK = request for a dark frame measurement.
  CLEAN = request for a CLEAN procedure.
  OBS is obviously mandatory, the three others are optional. CLEAN has no effect for SW.

  A flat-field frame and a dark frame are 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 in an identical configuration, if not found, a library frame will be used automatically.

• PROC_CAL : the observer can request a flat-field measurement with the filter selected (see section and ).
• 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_STAB = = number of stabilization exposures before a single pointing observation, or before the first point of the raster.
• N_EXPOS_POL = = total number of exposures needed to attain the required S/N ratio at each position of the wheel (hole or polarizer). The total number of exposures of the whole observation is thus 4 .