plgchr: Get character default height and current (scaled) height

The PLplot Plotting Library: Programmer's Reference Manual
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### `plgchr`: Get character default height and current (scaled) height

`plgchr` (p_def, p_ht);

Get character default height and current (scaled) height.

`p_def` (`PLFLT *`, output) Pointer to default character height (mm). `p_ht` (`PLFLT *`, output) Pointer to current (scaled) character height (mm).

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