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Peter,
I'm not sure where you are going with the pedestal. Can you please elaborate? The pedestal is removed during either a dark and/or bias subtraction, though it can also be removed manually using pixel math. Most processing software use a pedestal value of 100 counts as many cameras write this value to the FITS header. This is to ensure the lowest ADU is still positive (zero is still considered positive). I'm not sure how relevant this is to bias subtraction, thus hoping you can shed light on your statement. Thanks.
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