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Hi Peter,
The gain, read noise and pedestal values under CCDstack camera manager are really only beneficial for data rejection algorithms, specifically sigma-rejection and poisson-rejection. The default values will work ok but if you are keen, you'll likely want to reflect the correct values.
I wouldn't get too hung up on the S/N stat as you may find yourself chasing your tail when in reality signal is going to be gained and noise reduced through stacking (square root).
The bias master looks fine but I don't have anything to compare it against. The dark frame test no doubt already included the bias. It appears to give the lowest S/N.
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