DCL:GRPH1:SLPACK: Layout Routines:Explanation of Main Subroutines
Places the specified margins in all frames on each level.
CALL SLMGN(XL,XR,YB,YT)
XL, XR, YB, YT (R) The left-hand, right-hand, bottom, and top margins, respectively. The left- and right-hand margins are specified in ratio to the horizontal width (of 1), and the bottom and top margins are specified in ratios to the vertical width (of 1).