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Thank you very much all.
The artefact you have found is neither a column defect or a satellite trail. When I was beta-testing I was using beta drivers for CCDSOFT, Maxim, CCDOPS - trying them all. What you see is the result of a bug in the CCDSOFT driver, which kept the shutter open during the download. I took many frames with CCDSOFT in many images, and some were effectively removed through dithering etc, but I also had to manually clone out dozens....I clearly missed this one.
I reported that bug, so hopefully it is now fixed.
cheers
Martin
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