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21.6 Updates to calstis

We expect calstis modules to evolve and improve with time, particularly during Cycle 7, as we understand and characterize more fully the on-orbit performance of STIS. It is possible, even likely, that improvements in the calstis software will improve the calibration of your data. To determine the version of the software used to calibrate your data, note the value of the CAL_VER keyword in the data header. The following example uses hselect to print the rootname, the optical element, and the version of calstis for all _flt files in the current directory:

cl> hselect o*_flt.fits[0] "rootname,opt_elem,cal_ver" yes

Watch the Space Telescope Analysis Newsletters (STANs) or consult the STIS WWW pages for any announcement of enhancements to calstis. If you are uncertain whether a given enhancement to calstis merits recalibrating your data, contact the Contact Scientist for your program. Often, it is instructive to recalibrate and to determine empirically whether the revised calibration files or software affect the scientific interpretation of your data. If you need to upgrade your version of the stis package, contact your IRAF system administrator.

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