TAB_VAL

       Routine to read a column from an SDAS table file

       values = tab_val( tcb, table, column, [ rows ] )

       tcb - table control block returned by tab_val
       table - table array returned by tab_val
       column - scalar column name or number

       rows - scalar giving row number or vector giving rows.
               If not supplied all rows are returned.

       the values for the specified column (and rows) is returned
       as the function value.  If row is specified as a scalar
       (single row) then the result will be a scalar.

       version 1  D. Lindler  Jan. 1988
       Allow for a null column Landsman/Feggans    April 1992
       Converted to IDL V5.0   W. Landsman   September 1997

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