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For the present reduction of the BND spectra we have chosen a region of interest approach. The extracted x-ray line count rate is divided by the quantum efficiency of the BND at the x-ray line energy. We have assumed the same theoretical quantum efficiency (QE) function for the four BND-H detectors. The quantum efficiency of the BND flow proportional counter for this analysis was based on theoretical calculations assuming a 1 m polyimide (C22H10O4N2) thick counter window with a density of 1.3 gr cm-3, a 200 layer of Al, a counter gas of P10 at 400 torr and at 50 F with a gas depth of 2.16 inches. The area of a BND counter at the HRMA location was taken to be 32.3 cm2. We have incorporated a correction for mesh obscuration in the BND area.