Fig. B.1
Stacked normalized EPIC surface-brightness profile for 21 blank fields (see Table A.1). Top panel: profile produced without accounting for the QSP component. The surface brightness increases steadily moving from the center to outer regions of the detectors. Bottom panel: profile produced after subtraction of the QSP component. Beyond the innermost arcminute, the profile is flat, within deviations contained within 5%−10%.
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