FXBFINISH

       Close a FITS binary table extension file opened for write.

       Closes a FITS binary table extension file that had been opened for
       write by FXBCREATE.

       FXBFINISH, UNIT

       UNIT    = Logical unit number of the file.

       None.

       None.

       None.

       ERRMSG  = If defined and passed, then any error messages will be
                 returned to the user in this parameter rather than
                 depending on the MESSAGE routine in IDL.  If no errors are
                 encountered, then a null string is returned.  In order to
                 use this feature, ERRMSG must be defined first, e.g.
                       ERRMSG = ''
                       FXBFINISH, ERRMSG=ERRMSG, ...
                       IF ERRMSG NE '' THEN ...

       None.

       Uses common block FXBINTABLE--see "fxbintable.pro" for more
       information.

       The file must have been opened with FXBCREATE, and written with
       FXBWRITE.

       Any bytes needed to pad the file out to an integral multiple of 2880
       bytes are written out to the file.  Then, the file is closed.

       Data Handling, I/O, FITS, Generic.

       W. Thompson, Jan 1992.
       W. Thompson, Feb 1992, modified to support variable length arrays.
       W. Thompson, Feb 1992, removed all references to temporary files.

       William Thompson, GSFC, January 1992.

       Version 1, William Thompson, GSFC, 12 April 1993.
               Incorporated into CDS library.
       Version 2, William Thompson, GSFC, 21 July 1993.
               Fixed bug with variable length arrays.
       Version 3, William Thompson, GSFC, 31 May 1994
               Added ERRMSG keyword.
       Version 4, William Thompson, GSFC, 23 June 1994
               Modified so that ERRMSG is not touched if not defined.

       Version 4, 23 June 1994
       Converted to IDL V5.0   W. Landsman   September 1997

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