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Its fixed pattern noise. It looks like the architecture of the sensor. I have seen this on a Starlight Express Trius 694.
I found a good bias would subtract it out. I often only used a bias with that camera. If I didn't use a bias I would see that.
You need a good bias with lots of frames and at the exact imaging temperature.
Try that and see if it solves the problem. I used CCDstack.
Greg.
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