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

6.2. DATA ANALYSIS 43
When you are satisfied we can perform the first calibration steps of DARK correction and
deglitching. As in Section 4.2, the data does not need stabilization correction – if you are
not convinced you can check this with x3d before progressing.
CIA> corr_dark, bs_pds
CIA> deglitch, bs_pds
Now the PDS contains a nicely calibrated cube. Again, you might want to check this with
x3d – see Figure 6.1. Use the same calling sequence as above.
7. Now we can create the EXPOSUREs
CIA> reduce, bs_pds
and perform flat field correction
CIA> corr_flat, bs_pds
8. You may be curious as to which EXPOSUREs are source and which are reference:
CIA> print, bs_pds.src_image
1 5 9 13
CIA> print, bs_pds.ref_image
3 7 11 15
You can use x3d to look at the EXPOSUREs:
CIA> x3d, bs_pds.image
Use the slider to select the desired EXPOSURE, e.g. for the second source EXPOSURE
set the slider to 5.
9. Finally we can create the beam-switch MOSAIC. This is simply done.
CIA> reduce_bs, bs_pds
reduce bs adds up all the source EXPOSUREs and subtracts the reference EXPOSUREs
(taking the MASK into account of course). To display this MOSAIC:
CIA> tviso, bs_pds.raster
You should see the same image as in Figure 6.2. Note that for historical reasons the
beam-switch MOSAIC is placed in the field .RASTER.
10. You may wish to save the results of the data analysis. You can do this with IDL’s SAVE.