"Apache" <apa### [at] yahoocom> wrote in message
news:3e026607$1@news.povray.org...
> I'd use Heun if I were you. And if possible even higher orders. The system
> will be much more stable and allow larger timesteps.

Ok, I will try that. It seems that it might not be an instability problem after all,
but
Christoph is looking at other possible causes.

All the best,

Andy Cocker

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