Invisible wrote:
> Pop quiz: The image shows signs of instability. (Those raggid edges are 
> probably supposed to be perfect curves.) How do I solve this?
> 
> 1. Decrease the maximum time step size?
> 2. Decrease the minimum time step size?
> 3. Decrease the maximum error bound?
> 
> Answers on a postcard. ;-)

Well, #1 is unlikely to have an effect. The operative question, though, 
is whether the minimum time step size is actually being reached or not.

I don't have an answer to that question, but I just reduced the maximum 
error bound ten-fold, and suddenly the images seem significantly less 
"noisy".

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