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I'm not sure it's not DSS. I've attached two images, the resolution's not great due to resizing to under 200 kB but you can still see the mottled background in one. This were the same files stacked in DSS, no darks or flats used, the only difference was one was comet mode with no trailed stars or comet (the mottled one) and one was stack on stars with a trailed comet (to better one).
It may not be visible in the smaller versions, but the direction of the mottling matches the direction of the comet's travel.
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