Equivalent width of the relativistic broad 6.4 keV Fe Kα line vs. hard X-ray counts (2–10 keV) for the FERO sources. Filled circles indicate line detections at ≥ 5σ confidence level (where error bars indicate the 90% confidence level intervals), while filled squares indicate line upper limits at the 90% confidence level. White stars indicate sources belonging to the flux-limited sample (see Sect. 2.2, for details).
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