EW of the relativistically broadened iron line in the FERO+GREDOS sample against the: disc inclination angle (upper panels); primary illuminating continuum power-law spectral index (medium panels); and iron abundance (lower panels). The left column shows the whole sample, the right column shows only the data points corresponding to line detections, after correction of the EW values for the dependence on the other two parameters according to George & Fabian (1991) and using the following common reference values: Γ0 = 1.9; ı0 = 30°; ZFe,0 = Z⊙. The solid line indicates the predicted behaviour according to George & Fabian (1991). Filled symbols indicate detections.
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