ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

12.3. DATA SLICING WITH X SLICER 89
12.3.3 Selecting slicing variables
The next step to slice a file is to select the variables according to which the slicer will slice the
file. For each record in your file, the slicer will check the chosen variables. If their value has
changed, it will flag the record and propose to build a new SCD starting from this record.
You can slice according to the following variables :
• Entrance Wheel: the position of the Entrance Wheel of CAM (hole, polarizers. . . ).
• Selection Wheel: the wheel that reflects the light on the SW or LW channel. WARNING:
the selection wheel on SW for example does not imply that the operating channel is SW!
(Think about a LW dark measurement for example.)
• LW lens Wheel: the position of the LW lens wheel of CAM.
• LW filter Wheel: the position of the LW filter Wheel of CAM.
• SW lens Wheel: the position of the SW lens wheel of CAM.
• SW filter Wheel: the position of the SW filter wheel of CAM.
• Observation Channel: it tells you if you are observing with the LW or SW detector.
WARNING: its value is independent of the selection wheel value.
• Beam Switching: beam-switch mode, flags the cycle number, the reference and the source.
• AOT: the one of the three AOT of CAM that was used.
• Observation Type:
observations.
AOT, CUS (Calibration Up-link System), or other type of driven
• Detector Offset: No longer useful, since there is only one offset per gain of the detector.
• On Board Process: Normal mode, accumulated mode or sampled mode of CAM detector
reading.
• Integration Time: value of the integration time.
• Detector Gain: value of the detector gain (x1, x2 or x4).
• Observation mode: OBS, DARK, WAIT, IDLE, GAP ...
• On target Flag: On if the telescope is on target and the qla flag is OK (see Section 19.6.7).
• Raster Mode: for raster, micro-scan or staring observations.
• M Raster Position: the position along the first axis of the raster.
• N Raster Position: the position along the second axis of the raster.
• Sequence Number: order number of the SCD in the observation sequence.
• Parallel Mode: CAM is parallel or prime instrument.