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You’ve a very good set of data, but you also have a “pattern” going from the top to bottom under roughly -120deg angle.
I’d try to use bias (and dark) frames to implement partial calibration and then you should be able to almost get rid of it.
It looks like all Canons have similar “noise” issue that shows on bias frames as “verticalish” pattern, so –
is my guess correct that the original picture was rotated by -30deg?
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