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Or with radial and angle gradients set at difference, and white and some very darkish green:

Gaussian: sorry, I must have overlooked your post. It is indeed very shorthand, that's true. Partly because it was meant in the first place for myself as I tend to forget how I achieved something, and partly also because it is an attempt (like most of my postings) to create a fire of experiments in scattered directions.  It was not intended as a tutorial: I still leave that to the "real" guys. What I do is try to keep things going. Still, if anyone wants a more detailed explanation, I'm always willing to give it. But I spend so much time typing...[sleepy]