plsmin: Set length of minor ticks

`plsmin`: Set length of minor ticks
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#### `plsmin`: Set length of minor ticks

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

This sets up the length of the minor ticks and the length of the terminals on error bars. The actual length is the product of the default length and a scaling factor as for character height.

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

  The default length of a minor tick in millimeters, should be set to zero if the default length is to remain unchanged.

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

  Scale factor to be applied to default to get actual tick length.

Redacted form: `plsmin(def, scale)`

This function is used in example 29.

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