Relativistic line EW as a function of the background-subtracted 5–7 keV counts in the GREDOS (circles) and FERO (squared) samples sources. Empty symbols indicate upper limits. The lines represent the sample sensitivity for three different values of inclination angle, assuming α = 2.5: dashed line: 10°; dot-dashed line: 40°; dot-dot-dashed line: 80°.
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