There's a thorough explanation for this behaviour in Mike Williams' tutorial
here :
http://www.econym.demon.co.uk/isotut/keywords.htm
Sometimes method 1 is enough, sometimes not...
G.

Tom Melly wrote:

> Many thanks - a quick re-read of the docs combined with your fix, and the
> solution seems to be to remove the "method 2". max_gradient 1 is then okay
> (or can also be omitted).

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