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Fig. 4


The upper panel shows the best-fit temperatures (asterisks) and 1σ uncertainties (boxes) in the hard band obtained with the XMM-Newton pn and BeppoSAX MECS instruments. The lower panel shows the relative MECS-pn temperature difference, fT = ΔT /  ⟨ T ⟩  (diamonds), and its 1σ uncertainty. The dotted and dashed lines show the weighted mean of fT ±  the error of the mean.

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