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HSCALE

 HSCALE.......Normally, the plot is made inside a frame 6.5 inches  high
              and 9.0 inches wide  centered inside an  outer 8.5 x  11.0
              inch frame, with  numbering and  labelling in  the 1  inch
              margin.  Sometimes, the numbers occupy too much space, and
              shrinking the  inner frame  is desirable.   HSCALE may  be
              provided as a number  in the range  0.0..1.0 to scale  the
              frame horizontally.  (See  also VSCALE  below).  A  square
              inner frame may be obtained by setting HSCALE = 6.5/9.0  =
              0.722222.