Find this document at http://www.ncsa.uiuc.edu/Classes/MATH198/ivanhoe
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Here is gratuitous picture which pops up uninvited.
Here is a fully referenced picture.
Here is a locally referenced picture that doesn't
happen to exist, yet!
Here is a David Parker Graph romboy and here is another one
in binary
harlequin
But both of these work ONLY on a PC because they require the DPGraph
viewer (free) or DPGraph itself (licensed).