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XIS peak location vs Cut Off Rigidity for recent times (201101).
while the last points of xis3 (FI) seem a bit odd, but neither the FI nor the BI are well fit with a line. The peak locations are not a function of the background variations.
Here are plots of the xis1 (BI) high energy count rate vs cut off rigidity to compare to the ACIS s3 (BI) high energy reject rates used to track the background levels for ACIS.
For January 2011: 
For November 2006:
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