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DERIV-ARRAY

 DERIV(*)..... .TRUE. - Plot derivative of interpolated curve K.
              .FALSE. - Plot curve K itself (default).

              This option has no effect unless NUMINT(K) .NE.  0.   When
              derivative plotting is requested, it will be necessary  to
              explicitly supply YMIN, DYSUB, and YMAX, since these  will
              in general be  unrelated to the  input values Y(*,*)  from
              which the default YMIN, DYSUB, and YMAX are determined.