The PLplot Plotting Library: Programmer's Reference Manual
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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.

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plstyl: Set line styleUpplsxax: Set x axis parameters