Originally posted by vjs
no everytime the simga value is chosen at random.
That would be surprising for me...
Actually, each sigma value should be random, in the sense that it is highly unlikely to get the same value twice in such a short time.

Even if it happens, it's not that bad. That one curve is useless then, but the next curve should have a new (and unused) sigma value.

Your 1490 curves are completely valid, assuming you still have the output and/or checked that no factor has been found.