TAB_MODCOL

       Modify column description in a STSDAS table

       tab_modcol, tcb, column, units, format, newname

       tcb - table control block
       column - column name or number to be modified

       units - string giving physical units for the column.
               If not supplied or set to the null string
               the units are not changed.
       format - print format (either fortran or SPP format)
               An spp format should be preceeded by a '%'.
               If not supplied or set to a null string, the
               print format for the column is not changed.
       newname - new name for the column.  If not supplied
               or set to a null string, the name is not
               changed

       change the wavelength column to WAVE with a new format
       of 'F10.3' and columns units of ANGSTROMS.
          tab_modcol,tcb,'wavelength','ANGSTROMS','F10.3','WAVE'
       Change to print format of column 3 to spp format
       20.10e
          tab_modcol,tcb,3,'','%20.10e'

       version 1  D. Lindler   Apr 1989
       Converted to IDL V5.0   W. Landsman   September 1997

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