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Line drawings are presented as vector graphics-a collection of lines between points. The drawings are usually as large as can be accommodated by the window (or subwindow) size. (A complete display list is calculated before any lines are drawn; the bounds of the list are then used to determine the scaling factor.) It may not be desirable to have edges of a drawing coincide with the window borders. A small but noticeable margin results with a Margin 0.03. The scaling is computed so that no drawing is made in the margin. The default is 0, i.e., no margin. The margin may be violated with Zoomed images, which used the original, un-zoomed display list; the image will be clipped at the window (or subwindow) boundaries.
The margin is set with Draw Margin under the Graphics menu.