http://www.venganza.org/ (scroll down to the graph)

May be junk, but it still sort of illustrates some of the problems in actually
proving GW.

Adrian

--
Adrian Shaw ais@
Adran Cyfrifiadureg, Prifysgol Cymru, aber.
Aberystwyth, Ceredigion, Cymru ac.
http://users.aber.ac.uk/ais uk