plssym: Set symbol size

`plssym`: Set symbol size
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#### `plssym`: Set symbol size

`plssym (` | def ,
| scale `)`;

This sets up the size of all subsequent symbols drawn by `plpoin` and `plsym`. The actual height of a symbol is the product of the default symbol size and a scaling factor as for the character height.

`def` (``PLFLT``, input)

  The default height of a symbol in millimeters, should be set to zero if the default height is to remain unchanged.

`scale` (``PLFLT``, input)

  Scale factor to be applied to default to get actual symbol height.

Redacted form: `plssym(def, scale)`

This function is used in example 29.

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