plschr: Set character size

The PLplot Plotting Library: Programmer's Reference Manual
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### `plschr`: Set character size

`plschr` (def, scale);

This sets up the size of all subsequent characters drawn. The actual height of a character is the product of the default character size and a scaling factor.

`def` (`PLFLT`, input) The default height of a character 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 character height.

Redacted form: `plschr(def, scale)`

This function is used in example 2,13,23,24.

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