plssym: Set symbol size

The PLplot Plotting Library: Programmer's Reference Manual
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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 not used in any examples.

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