FXBDIMEN()

      Returns the dimensions for a column in a FITS binary table.
 Explanation : This procedure returns the dimensions associated with a column
               in a binary table opened for read with the command FXBOPEN.
 Use         : Result = FXBDIMEN(UNIT,COL)
 Inputs      : UNIT    = Logical unit number returned by FXBOPEN routine.
                         Must be a scalar integer.
               COL     = Column in the binary table to read data from, either
                         as a character string containing a column label
                         (TTYPE), or as a numerical column index starting from
                         column one.
 Opt. Inputs : None.
 Outputs     : The result of the function is an array containing the
               dimensions for the specified column in the FITS binary table
               that UNIT points to.
 Opt. Outputs: None.
 Keywords :    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 = ''
                               Result = FXBDIMEN( ERRMSG=ERRMSG, ... )
                               IF ERRMSG NE '' THEN ...
 Calls       : FXBCOLNUM, FXBFINDLUN
 Common      : Uses common block FXBINTABLE--see "fxbintable.pro" for more
               information.
 Restrictions: None.
 Side effects: The dimensions will be returned whether or not the table is
               still open or not.
               If UNIT does not point to a binary table, then 0 is returned.
               If UNIT is an undefined variable, then 0 is returned.
 Category    : Data Handling, I/O, FITS, Generic.
 Prev. Hist. : None.
 Written     : William Thompson, GSFC, 4 March 1994.
 Modified    : Version 1, William Thompson, GSFC, 4 March 1994.
               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     : Version 3, 23 June 1994
       Converted to IDL V5.0   W. Landsman   September 1997

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