FXBCLOSE

       Close a FITS binary table extension opened for read.

       Closes a FITS binary table extension that had been opened for read by
       FXBOPEN.

       FXBCLOSE, 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 = ''
                       FXBCLOSE, ERRMSG=ERRMSG, ...
                       IF ERRMSG NE '' THEN ...

       None.

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

       The file must have been opened with FXBOPEN.

       None.

       Data Handling, I/O, FITS, Generic.

       W. Thompson, Feb. 1992.

       William Thompson, GSFC, February 1992.

       Version 1, William Thompson, GSFC, 12 April 1993.
               Incorporated into CDS library.
       Version 2, William Thompson, GSFC, 21 June 1994
               Added ERRMSG keyword.
       Version 3, William Thompson, GSFC, 23 June 1994
               Modified so that ERRMSG is not touched if not defined.

       Version 3, 23 June 1994
       Converted to IDL V5.0   W. Landsman   September 1997

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