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Very nice nebula Graham, the Baby Q looks like it is performing really nicely! I personally largely haven't noticed much in the way of gradients with my 3nm narrowband filters from the burbs of Melbourne, light pollution is pretty much negated due to the narrow band width. I would guess flats are the issue then with a slight overcorrection on the RHS.
What are you using to do flats? It could be caused by an EL panel that is not quite flush or sky flats that are not on the opposite side of the sky to the rising/setting sun.
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