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It looks like it may be pattern noise in the chip.
I don't recall ever see anything like that in the 2 STL's I had.
There was an issue with STL11's that got fixed by a firmware update. But that was more a central banding I thought.
I'd check to make sure you have the latest firmware as a starting point.
It sounds like a pedestal issue? That may be able to be adjusted.
As you have done it is standard practice to subtract a flat dark from a flat.
Greg.
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