V10/vol2/ADM/bm.mac

.de IB	\" Begin a Picture
.	\" $1=file(page) $2=height $3=width $4=position
.	\" Height, width, position, and offset are for the frame, flags is for
.	\" the picture. The position flag should be l, c, or r. Omitting the
.	\" position argument is also allowed for compatibility with the original
.	\" version of the macro.
.BB
.nr z2 \\$2u
.nr z3 \\$3u
.if '\\$4'l' .nr z5 0u
.if '\\$4'c' .nr z5 (\\n(.lu-\\n(z3u)/2u
.if '\\$4'r' .nr z5 \\n(.lu-\\n(z3u
.	\" $1=file(page) $2=height,width,yoff,xoff $3=flags
.X COORD \\$1
\\X'PI:\\n(.o:\\n(.i:\\n(.l:\\n(.t:\\$1:\\n(z2u,\\n(z3u,0u,\\n(z5u:\\$4:'
.SP \\n(z2u
.BB
.rr z5
.rr z2
.rr z3
..