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The purpose of this section is to present the measured counting rate and inferred photon fluxes during XRCF phase I measurements.
Also presented is the ratio of ACIS detected counts (corrected for pileup and filter efficiencies) to the flux detected by the Beam Normalization Detector (corrected for source to detector distance). This information, combined with the absolute efficiency of the Beam Normalization Detector (which is not available to us at this time) can be used to determine the the absolute quantum efficiency of the ACIS CCDs.