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.

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plrgb1: Set line color by 8-bit RGB valuesUpplscmap0: Set color map0 colors by 8-bit RGB values