Fraction of galaxies containing an X-ray-bright AGN as a function of r at low redshift (left panel) and high redshift (right panel). The AGN fraction is plotted separately for quiescent galaxies (in red), star-forming (in blue), low-mass (dashed line) and massive galaxies (solid line). The coloured bands represent the 68% confidence intervals obtained with binomial statistics (see Sect. 3). Central BCGs are excluded.