Fluxes vs. redshift. Empty shapes are for the minimum fluxes and filled shapes for the maximum fluxes from the FP. Colors indicate BH mass and black crosses SFR fluxes. Circles, triangles, and squares are for log(L_X) = 43 erg s⁻¹, log(L_X) = 43.5 erg s⁻¹, and log(L_X) = 44 erg s⁻¹, respectively. The orange and black lines are sensitivity limits for SKA and ngVLA, respectively, for integration times of 1 hr (solid), 10 hr (dashed), and 100 hr (dotted).