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Hello Bo,
I use gradient exterminator - but I find it is best for uniform gradients, especially vignetting.
For uneven/variable gradients I use a free program called fitswork4 - it's gradient control is excellent and it has good ability to choose multiple areas that you don't want to include in the calculation (like faint nebulosity)..
It's free - so it's worth a try.
Tony.
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