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Fig. 4

image

Fitted MOS1 (black), MOS2 (red), and pn (green) spectra for the NPS pointing 17 along with the RASS spectrum (blue) for a region with a diameter of one degree centered on the pointing. For each of the EPIC spectra three curves show the fitted broken power law that represents the soft proton background (lower for all), the fitted cosmic spectrum plus fluorescent background lines (middle for all), and the sum of the two representing the best fit to the data. The MOS fluorescent lines are the Al K alpha and Si K alpha at 1.49 and 1.74 keV, respectively. The pn fluorescent lines are the Al K alpha and a variety of Cu, Ni, and Zn lines around 8 keV.

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