Fig. 2
Intensity of the Fe Kα against the observed flux in the 4–5 keV energy band. The dotted line indicates the locus of constant line EW, normalized to the value measured during the deepest XMM-Newton observation (October 2000). The dashed line indicates the linear best fit, whereas the dot-dashed lines indicate the envelope corresponding to the 1σ uncertainties on the best-fit parameters.
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