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Hi Pat. That is quite a gradient. Not sure flats taken the next day is necessarily responsible, though, I would take flats just after imaging, because they are quick to take and you can be extra sure of their suitability - focus/temperature.
I don't know how to remove gradients in PS or GIMP and prefer a dedicated program with a gradient removal tool. Perhaps the trial version of StarTools and see if the Wipe module will improve on things.
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