The upper panels show the best-fit temperatures (asterisks) in the hard band obtained with XMM-Newton pn vs. those obtained with Chandra ACIS using CALDB 3.4 (left panel), CALDB 4.1.1 (middle panel) and CALDB 4.2 (right panel). The lower panels show the relative ACIS-pn temperature difference, fT = ΔT / ⟨ T ⟩ (diamonds) and its 1σ uncertainty. The dotted and dashed lines show the weighted mean of fF ± the error of the mean.
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