After running frfread, this routine does the following:
All raw event files with no events are then deleted, and frame mode files are renamed to begin with "fr" so that they can be saved as trend products. Files with empty GTI extensions are also deleted, but an error is given when this happens.
The TSTART and TSTOP keywords in the HK files are checked for sensible values. frfread errors have sometimes caused TSTART=0.0.
All of the good time intervals for a given instrument are collected into a FITS extension which is appended to the approprate HK file. Only GTIs wholly contained between TSTART and TSTOP of a particular HK file are included in that file's extension.
FTOOLS called: