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

176 CHAPTER 15. CIA DATA STRUCTURE HIGH-LEVEL ARCHITECTURE
CIA> cds_display, ’CCGLWDARK_96052312123000’
All the parameters from the CAL-G FITS file are graphically displayed – see Figure 15.1.
Clicking on the appropriate button will display plots of voltage and temperature statistics.
Clicking on IMAGE M-Image will display a window containing the data image alongside its
error image and allow you to scroll through all the images in the CDS. You can also load an
additional CDS from disk by clicking on CDS+.
15.4 Auxiliary calibration data
Along with CDSs, there are additional calibration data contained in the CIA distribution. These
are described in the following subsections.
15.4.1 Theoretical PSFs
CIA is distributed with a limited number of theoretical PSFs for use by xphot. A full set
of 210 theoretical PSFs for all possible optical CONFIGURATIONS of CAM, along with the
observed PSFs described in Section 15.4.2, can be found in the subdirectory psf at the official
CIA ftp site. In order for CIA routines to find these PSFs they should be placed in the directory
$cia vers/data/cds/. The PSFs same may be shared between all CIA versions at your site by
using soft links.
The theoretical PSFs are derived from the theoretical camera model – the model includes
the transmission profile of a particular filter by assuming a flat spectral shape of the source.
Note that no stray-light features have been considered. Though originally generated for use by
xphot many observers have found them invaluable for advanced analyses such as jitter correction
(Section 22.1) and source simulation.
The theoretical PSFs are stored as IDL save sets and with filenames of the following format:
Fixed filters e.g. psf lw5 6p0as.save
psf filter pfov.save
CVF filters e.g. psf 9p5mic 3p0as.save
psf wavelength-in-microns pfov.save
Extracting a PSF can be easily done with the aid of make psf name. Just give this routine
a PDS and it return the correct filename for the appropriate PSF library:
CIA> restore, make_psf_name(raster_pds), /verb
% RESTORE: Portable (XDR) SAVE/RESTORE file.
% RESTORE: Save file written by aussel@challenger, Sat Nov 29 23:24:43 1997.
% RESTORE: IDL version 5.0 (sunos, sparc).
% RESTORE: Restored variable: PSF.
.
If you don’t have a PDS then you can supply the necessary parameters directly:
CIA> restore, make_psf_name({aot:’raster’, wavelength:’6.75’, pfov:3.0, $
CIA> fltrwhl:’lw2’}, ack=ack), /verb