Distributions of RADEC_ERR (upper panels) and flux measurement significance (in terms of ML_RATE_1/ML_RATE_ERR_1, lower panels) as a function of detection likelihood for point sources in the eRASS1 single-band detected catalogue (left panels) and in the Hard catalogue (right panels). In the left panels, the 40, 68, and 95% contours are plotted in orange, while the cyan line indicates an empirical correlation that describes the mode of the distribution, as reported in the label. Sources from the Main catalogue are shown in blue, those from the Supplementary catalogue in grey. The right panels (Hard catalogue) have only the 68% contour plotted. Note that the lower right panel displays the likelihood and flux significance in the 2.3–5 keV band.