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I just did a stack of the raw uncalibrated images and got the same result. So it is not a problem with the calibration frames. The artifact is in the original subs. And you see in the stacked image the corresponding shifts on the left and right edges. So there appears to me to be an extraordinary number of hot pixels plus there is some drift from frame to frame.
Might be time to consider retiring either my CCD or myself I fear. I think one or other of us has had its day.
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