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Looks pretty clean to me, how high is the ADU for that region over the background average? I'm guessing pretty low noise if its a 694 sensor. I pretty much see one on either side of my bias frames with an 8300. Master bias = gone.
Perhaps subtract a master bias from your dark to see if its gone and simply a result of readnoise? If not, try a 5min dark and see its value, could be noise building from the amplifier over time?
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