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I've had them before on images with my 60Da where the sensor has been at ridiculously high temperatures - 35 degrees or more. Particularly with dark frames - I can actually see the striations on the darks themselves.
Do you know what your sensor temps were?
I'm guessing, but maybe also if the temps from the subs from the two nights were very different you could ave issues. Did you take a separate set of darks each night?
What ISO and exposure times did you use?
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