Thanks Mike for pointing me to your updated ISO toturial!  I hadn't noticed
the update about splines. Surely I'll look into this and add it to my plans
for.... something... I won't tell yet... :o)  I don't know if I'll succeed.
Thanks also to Trevor, Jonathan and Ingo who replied so far.  I'm sure Ingo
will succeed with his project, I have the feeling he is good at math and
maybe those macros could merge with mine - it depends on a few things, but
in general it's not necessary to have 2 files doing the same thing.  And it
might be that more people are trying to code something like this and their
input will be appriciated as well.

Hugo

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