Table 1. GROFF Units

     
      INDICATOR	NAME	CLASS*	UNIT VALUE

i	inch	abs	1 inch<\n>
c	centimeter	abs	1 centimeter<\n>
p	point	abs	1/72 inch<\n>
P	pica	abs	1/6 inch (12 points)<\n>
m	em	rel	current font size in points<\n>
n	en	rel	1/2 em<\n>
M	<\#147>emette<\#148>**	rel	1/100th of an em<\n>
v	leading	rel	current vertical spacing in points<\n>
u	basic unit	dev	device resolution [1/72000 inch]<\n>
z	sizescale	dev	basic units per point [1000]<\n>

Notes:

*	Scale units are classified according to whether the
unit represents an absolute unit of measure, is relative
to the current pointsize/leading or is device dependent
(values in brackets are applicable for PostScript devices).

**	A groff extension (as is the <\#147>z<\#148> unit); the name
given here is contrived by the author.