The upper panels show the best-fit temperatures (asterisks) and statistical 1σ uncertainties (boxes) in the soft and hard bands for XMM-Newton instruments pn (left panel), MOS1 (middle panel) and MOS2 (right panel). The lower panels show the relative soft-hard temperature difference fT (=ΔT / ⟨ T ⟩, diamonds) and its statistical 1σ uncertainty for pn (left panel), MOS1 (middle panel) and MOS2 (right panel). The dotted and dashed lines show the weighted mean of fT ± the error of the mean.
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