Anyway, it doesn't do what you wanted. You should use
diferrent variables than xx and yy in your external loops
(e.g. #while (sx < 2) and #while (sy < 2) and add #declare
xx = sx ; #declare yy = sy ; just before #while (i <
MaxIter))

	As for the error, do you get it immediately, or does it
loop some before crashing? (if the second, I'd be interested
in seeing the values of tt, xx, and yy just before the
crash...)

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* they'll tell you what can't * mailto:ber### [at] inamecom
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