Similar to Fig. 15, but now taking eRASS1-cosmo as the reference sample (85 entries) and eFEDS as the test sample. The vertical axis represents F500_0520, the 0.5–2 keV flux within R₅₀₀ reported in the eRASS1 catalogue (units 10⁻¹⁴ erg s⁻¹ cm⁻²). The horizontal axis is the catalogue redshift z_λ. Clusters falling in zones of zero eFEDS exposure have vanishing probability (P_i = 0). Other eRASS1 clusters are very likely to be detected in eFEDS (P_i ≃ 1); in fact they are, as shown by the black circles. The isolated point at the bottom of the figure only has a flux upper limit 1.5 × 10⁻¹³ erg s⁻¹ cm⁻².