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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