Thanks bemfarmer! I found it (by eye, without the script, that is too complicated for me ;-)
but it is funny, the outer curve is completely symmetrical (done with mirror) so I would expect that the error in the derived curve would be symmetrical too, and in that case the object should show as 2 curves, it should be broken at 2 places. that is why I did not think of an open curve at first.
thanks again!
wim
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