FITS_CLOSE

       Close a FITS data file

       FITS_CLOSE,fcb

       FCB: FITS control block returned by FITS_OPEN.

       /NO_ABORT: Set to return to calling program instead of a RETALL
               when an I/O error is encountered.  If set, the routine will
               return  a non-null string (containing the error message) in the
               keyword MESSAGE.   If /NO_ABORT not set, then FITS_CLOSE will
               print the message and issue a RETALL
       MESSAGE = value: Output error message

       Open a FITS file, read some data, and close it with FITS_CLOSE
               FITS_OPEN,'infile',fcb
               FITS_READ,fcb,data
               FITS_READ,fcb,moredata
               FITS_CLOSE,fcb

       Written by:     D. Lindler      August, 1995
       Converted to IDL V5.0   W. Landsman   September 1997
       Do nothing if fcb an invalid structure D. Schlegel/W. Landsman Oct. 2000
       Return Message='' for to signal normal operation W. Landsman Nov. 2000

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