SFR_norm vs. specific black hole accretion rate (λ_s, BHAR). The SFR_norm has been estimated after excluding quiescent systems from both the X-ray and the reference galaxy catalogues (see text for more details). The results are colour-coded based on the redshift interval. The measurements are grouped in λ_s, BHAR bins, with 0.5 dex width. Median values are presented and the errors are calculated using bootstrap resampling. The average SFR_norm values (black squares) are weighted based on the number of sources in each bin (coloured circles), across all redshift intervals. The errors on the average values correspond to the standard deviation within each λ_s, BHAR bin. The solid line presents the best fit of the average values: SFR.