Fig. 6
Left: hard- versus soft-band diagram (HSD): comparison of the count rates in the soft (0.2–2) keV and hard (2–10) keV band. Error bars correspond to 1-sigma uncertainties. Lines denote the best fit of the linear regression for low- (dashed) and high-S/N (solid) data. Left: results from Swift observations. Individual observations are shown as gray open symbols, while filled symbols denote results from merged data sets. Right: HSD of the XMM-Newton data. Dashed line shows the best fit of the linear regression.
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