http://www.research.att.com/sw/tools/graphviz/refs.html get the dot's user guide(dotguide.ps.gz) of interest is the 2.3 paragraph, titled Drawing Size and Spacing resume: The optional output size of the drawing is set by size="7.5,10" or the command line using -Gsize="7.5,10" if given The output ratio, ratio=x where x is is floating point of width/height. ratio=2.0 give a drawing twice as wide as it is high. ratio=compress needs size to been set, and make the drawing fit dimension If page=x,y is set, the layout is printed as a sequence of pages that can tiled or assemble into a mosaic. Common setting page="8.5,11" or page="11,17". Yes, I have mosaic of 32.5 by 42.5 inchs of those things. another option is margin=.5, because many printer have Internal hardware margin
