This sets up the length of the major ticks. The actual length is the product of the default length and a scaling factor as for character height.
Redacted form: plsmaj(def, scale)
This function is used in example 29.
- def (PLFLT, input)
- The default length of a major 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.