The original dark posted looked pretty fine to me.
Here is one from my FLI ML8300 at -40C 600 seconds. Not much noise but there is a pattern noise. The Kodak 8300 chip seems to be a real winner and more and more great images are coming from them in various manufacturer's cameras. Kodak really got it right with this one.
Little bit of amp glow top left otherwise very very clean and perfect. You won't see darks this perfect from many chips.
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