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As long as you haven't moved the camera you could redo the flats.
However may I suggest just redo your processing without any flats first and crop the galaxy to get rid of any vignetting. (If anything it will prove whether or not creases in the T-shirt caused this issue).
Cheers
Bill
EDIT: How long have you had your ASI1600? I mention this because people over on Cloudy Nights who have had the camera for 18 months are now seeing rivers of dew forming on the sensor, as the internal desiccants are now saturated and need replacing.
Last edited by billdan; 01-11-2018 at 01:29 AM.
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