TABLE_EXT

       Routine to extract columns from an STSDAS table

       TABLE_EXT, name, columns, v1, [v2,v3,v4,v5,v6,v7,v8,v9]

       name - table name, scalar string
       columns - table columns to extract.  Can be either
               (1) String with names separated by commas
               (2) Scalar or vector of column numbers

       v1,...,v9 - values for the columns

       Read wavelength and throughput vectors from STSDAS table, wfpc_f725.tab
       IDL> table_ext,'wfpc_f725.tab','wavelength,throughput',w,t
               or
       IDL> table_ext,'wfpc_f725.tab',[1,2],w,t

       GETTOK(), TAB_READ, TAB_VAL()

       version 1  D. Lindler  May 1989
       Accept Column Numbers as well as names, W. Landsman  February 1996
       Converted to IDL V5.0   W. Landsman   September 1997

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