Fig. 19

Upper panel: time dependence of the oxygen column densities and 1.0 σ statistical uncertainties of the contaminant fitted to the cluster data (diamonds) and the ones implemented in the public calibration at 4.5 arcmin distance from the centre of the FOV (lines) for XIS0 (black), XIS1 (red), and XIS3 (blue). Lower panel: time dependence of the difference.
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