plvasp: Specify viewport using aspect ratio only

`plvasp`: Specify viewport using aspect ratio only
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#### `plvasp`: Specify viewport using aspect ratio only

`plvasp (` | aspect `)`;

Selects the largest viewport with the given aspect ratio within the subpage that leaves a standard margin (left-hand margin of eight character heights, and a margin around the other three sides of five character heights).

`aspect` (``PLFLT``, input)

  Ratio of length of y axis to length of x axis of resulting viewport.

Redacted form: `plvasp(aspect)`

This function is used in example 13.

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