The value of pic variables can sometimes be modified by assignment to achieve a better-looking result. The following two lines change the width of the object boxes to 1.1" and the spacing between objects to 0.5". boxwid = 1.1; movewid = 0.5; The following variables can be redefined to change the layout of a drawing.

Variable Name | Default Value | Operation
--- | --- | ---
boxht | 0.3 | Object box height
boxwid | 0.75 | Object box width
awid | 0.1 | Active lifeline width
spacing | 0.25 | Spacing between messages
movewid | 0.75 | Spacing between objects
dashwid | 0.05 | Interval for dashed lines
maxpswid | 11 | Maximum width of picture
maxpsht | 11 | Maximum height of picture
underline | 1 | Underline the name of objects