Projected correlation function measured on a flux-limited sample selected from the eRASS1 mock by Seppi et al. (2022), in the range 0.1 < z < 0.6, following the selection scheme explained in Sect. 3. The black points show the measurement using spectroscopic redshifts in the simulation. The blue, orange, and green lines denote three tests where the redshift was degraded to mock a photo-z, by adding a scatter of σ_z × (1 + z) around the spec-z. The bottom panel shows the ratio to the spectroscopic redshift case.