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Calculation note: At 8keV, we expect around 30 ADUs per photon in high gain mode. At 6.4keV, we are seeing around 23 ADU per photon. currentADU/currentEnergy*8keV=23/6.4*8=28.75 ADU per photon which is close to 30 ADUs.
K-alpha table for Iron (6.4keV):
http://www.yourperiodictable.com/iron.php
K-alpha table for Copper (8.0keV):
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