1 ZSCALE
  Syntax:   ZSCALE id1 [:id1n] [&idb1] id2 [:id2n] [&idb2]
            [scale]
   where:   id1    is the input histogram identifiers
            idb1   is the (optional) input secondary identifiers
            id2    is the output histogram identifier
            idb2   is the (optional) output secondary identifier
            scale  is the amount to scale the z-axis by

  Scales the z-axis of a 3-D plot, or the bin contents of a 2-D plot by
  `scale'. For 2-D plots this is identical to the `SCALE' command.

