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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.