Fig. 2.
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EPIC-pn background scaling using the ACIS-S3 light curve. Left: long-term light curve of the Chandra ACIS-S3 particle background. Middle and right: EPIC-pn vs. ACIS-S3 NXB levels for the FF and EFF observation modes, respectively. For both modes, a quadratic model (red) fits the ratio better than a linear model (dashed black).
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