Figure 6.  The FI and BI data are compared.  The coarsely binned data are from the FI chip in the C-K region where the overall QE is quite low, so the data are heavily binned.  Nevertheless, there is a distinct edge that is not taken into account in the current OBF filter model.  The data agree reasonably well with the BI results, after accounting for a systematic QE difference of 20%, except that the BI data are somewhat lower than the FI data near 0.29 keV.