12 .ds Fn Figure\ \\n+(Fi
25 .ie \\n(VS>=41 .vs \\n(VSu-1p
39 .ie \\n(VS>=41 .vs \\n(VSu-1p
55 .if \\n(dl>\\n(BD .nr BD \\n(dl
56 .if \\n(BD<\\n(.l .in (\\n(.lu-\\n(BDu)/2u
63 .ie \\n(VS>=41 .vs \\n(VSu
81 .nr XP 2 \" delta point size for program
82 .nr XV 2p \" delta vertical for programs
83 .nr XT 4 \" delta tab stop for programs
84 .nr DV .5v \" space before start of program
89 .nr PI 0 \" paragraph indent
90 .nr PD 4p \" extra space between paragraphs