plsvpa: Specify viewport in absolute coordinates

`plsvpa`: Specify viewport in absolute coordinates
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`plsvpa`: Specify viewport in absolute coordinates

`plsvpa (`	`xmin` ,
	`xmax` ,
	`ymin` ,
	`ymax` `)`;

Alternate routine to plvpor for setting up the viewport. This routine should be used only if the viewport is required to have a definite size in millimeters. The routine plgspa is useful for finding out the size of the current subpage.

xmin (PLFLT, input): The distance of the left-hand edge of the viewport from the left-hand edge of the subpage in millimeters.
xmax (PLFLT, input): The distance of the right-hand edge of the viewport from the left-hand edge of the subpage in millimeters.
ymin (PLFLT, input): The distance of the bottom edge of the viewport from the bottom edge of the subpage in millimeters.
ymax (PLFLT, input): The distance of the top edge of the viewport from the bottom edge of the subpage in millimeters.

Redacted form: plsvpa(xmin, xmax, ymin, ymax)

This function is used in example 10.

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`plsvect`: Set arrow style for vector plots	Home	`plsxax`: Set x axis parameters