Fig. 10.
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Hardness ratio (7.0–9.0 keV/1.0–7.0 keV) versus observation date. The black crosses and blue and red lines represent the data, average models, and models with the optimized hardness modification, respectively. The data and models are the ACIS-stowed observations processed in VFAINT mode. CCD 0, 2, 3, and 5–7 correspond to I0, I2, I3, and S1–S3, respectively.
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