Comparison of the SFR_norm−L_X for different definitions of quiescent systems. Black circles show the SFR_norm−L_X measurements when we exclude from the X-ray sample and the galaxy reference catalogue, quiescent sources, based on the location of the lower, second peak in the sSFR distributions. Blue circles present the results when we exclude as quiescent those systems that have sSFR values 0.3 dex below the mean sSFR value. Errors are estimated via bootstrap resampling. The dashed horizontal line indicates the SFR_norm value (=1) for which the SFR of AGN is equal to the SFR of star-forming galaxies.