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Thanks, those examples made it a lot easier to understand how to stabilize patterns! I looked for this stuff in the wiki, but I guess it was just too simple to put in there..

Is there a collection of induction coils of arbitrary length somewhere? For example, I found these: http://argentum.freeserve.co.uk/dense.htm

I also made another kind of coil myself, but they are so simple that someone else probably found them, so if someone would tell me what they are called, I ...