.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 ..