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Cosmic Rays - I believe they lead to premature baldness, obsessive-compulsive behavior like sitting alone in a shed in the middle of the night, severe depression like finding all your subs are rubbish after sitting in a shed all night, alcoholism (q.e.d) and other maladies. Ergo, it must be cosmic rays - the symptomology all fits.
However, just to throw a spanner in the works - it's in all subs going back for the past month that I've checked so far (can't see it in bias frames) all the time. Either the sun has really decided we need a working over out here, or there is something else wrong. I just started another run of calibration frames and the first one out (just 5 minutes of dark) showed it.
So, sadly because it is starting to sound expensive, I fear the answer lies elsewhere.
Peter
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