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Yes I'd noticed it (and hoped others didn't 😀). I would like to say thats it's a previously undiscovered filament running through Leo, but I can't.  I've just had a look at the individual images and as far as I can see, none of them show it. I suspect it's an artifact resulting from stacking images taken at different F numbers resulting in an overall vignetting effect that the gradient remover couldn't quite remove (no flats used so it had to cope with both the vignetting and a large non-linear sky gradient north to south). It only shows on stretched images.

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