I was bored again - so - yet another knot, a hand coded spline.
Don't know if it has a name, but was lifted and tweaked from the top
of this page:
http://www.cs.ubc.ca/nest/imager/contributions/scharein/KnotPlot.html
--
Alf
http://www.peake42.freeserve.co.uk/
http://www.qsl.net/gw3srg/
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