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hi Lee. Seeing has been very variable here as well - last night started out at a bit under 3 and ended up over 5 arsec FWHM (ugly). Your graph looks like the sort of excursions I get in bad seeing. As far as I can tell, there is nothing much to do but put in the Ha filter or bin it 2x2 and get some low res colour on something that you might get good lum results on later. With your very low noise camera, you could also possibly try running some very short subs (eg 20 seconds) on something bright and see if that helps
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