Didnt waste your time doing the trip Humayun. Even considering what you think its short comings may be, its a damn great picture. Im sure a man of your talents, given enough time could cure it of the banding. Im not sure it is caused by USB else you would have seen evidence of it in other photos not necessarily astro. It is way down in the noise levels though, perhaps in a terrestrial shot the S/N ratio sorts it.
Anyway, wont hypothesize any longer.
Choice photo.
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