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The pileup correction applied to the data are based on CSR spectra, not XRCF spectra.
The only absolute quantum efficiency used here is that for s2. For the other devices, the quantum efficiency relative to s2 was determined by dividing the ACIS relative to SSD 5 values for each set. The flux at ACIS is then the detected counts, corrected for pileup and filter efficiencies, divided by the quantum efficiency relative to s2 times the absolute quantum efficiency of s2. The s2 quantum efficiency curve is presented in Figure 4.66.