Subparameter definition

mmmm[.nnn]: Specifies a value, which may be one (m), two (mm), three (mmm), or four (mmmm) digits (and which may be zero), and which optionally may be followed by a decimal point (a period) and up to three (nnn) digits.
IN | CM | MM | PELS | POINTS: A mandatory unit that follows the value. The unit can be inches (IN), centimeters (CM), millimeters (MM), pels, or points. If you specify the unit as pels or points you must specify the value as a whole number with no decimal point.