Fig. 4
Median and median absolute deviation of the hard band residuals (data/best-fit model) for XIS0 (black), XIS1 (red), and XIS3 (blue). The model is an absorbed single-temperature MEKAL, whose temperatures and metal abundances are independent for each instrument, fitted to 2.0–7.0 keV band using the public calibration. The data are regrouped to a uniform binning of 0.5 keV.
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