MUPDATE

##
MUPDATE

            [MRTCAL\]MUPDATE

        Update  in-place the relevant files from the internal buffers. This com-
        mand makes sense after modifying the structures created by  the  command
        VARIABLE in WRITE mode:
        - the index file is updated after MHEAD% has been modified,
        - the IMB-FITS file is updated after IMBF%, SUBS%, or IMBDATA% have been
        modified (NOT YET IMPLEMENTED).

        After this action, the files are updated on disk but not in memory. They
        should be re-read if needed.