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plwind: Specify world coordinates of viewport boundaries
DESCRIPTION:
This function is used in examples 1,2,4,6-12,14-16,18,21,23-27,29,31.
SYNOPSIS:
plwind(xmin, xmax, ymin, ymax)
ARGUMENTS:
xmin (PLFLT, input) : The world x coordinate of the left-hand edge
of the viewport.
xmax (PLFLT, input) : The world x coordinate of the right-hand edge
of the viewport.
ymin (PLFLT, input) : The world y coordinate of the bottom edge of
the viewport.
ymax (PLFLT, input) : The world y coordinate of the top edge of the
viewport.
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