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22 August 2019 at 11:44 am #581296
Dr Paul Leyland
You are almost certainly correct. SWarp was used to co-add a number of subs. As the intention was to acquire an image, any image, no biases, darks, flats, bad pixel masks or anything else were used. The filter wheel was playing up and I can no longer remember what, if any, filter was used. The FITS headers claim no filter, which seems plausible, but I wouldn’t swear to it.