1 . \"DS - display. If .DS C, center; L, left-adjust; I, indent.
9 . ta 5n 10n 15n 20n 25n 30n 35n 40n 45n 50n 55n 60n 65n 70n 75n 80n
10 . ie \\n(VS>=41 .vs \\n(VSu
24 .if \\n(.$ .if !"\\$1"I" .if !"\\$1"" .in \\n(OIu
25 .if \\n(.$ .if !"\\$1"I" .if !"\\$1"" .in +\\$1n
35 .de BD \" block display: save everything, then center it.
52 .de DF \" finish a block display to be recentered.
54 .if \\n(dl>\\n(BD .nr BD \\n(dl
55 .if \\n(BD<\\n(.l .in (\\n(.lu-\\n(BDu)/2u