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I would presume it is there in all images taken with the camera, but anything involving daylight overwhelms it.
To simplify processing I have been letting the cam do it's own darks by way of long exposure NR (Basically it shoots a light frame, then a corresponding dark which it subtracts form the light frame, the result being what you get)
I will try shooting a separate dark and if I can get the conditions right, flats and stretch them both to see if it shows up there. It is just too regular for me to think readily that it might be anything external to the camera (Noise wise)
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