Left panel: fraction of galaxies that host a radio AGN above a given radio luminosity, as a function of the black hole mass, for various radio luminosity limits (shown in different colours). Right panel: fraction of galaxies hosting radio AGN brighter than a given radio luminosity, separated by their black hole mass. Colours, lines, and errors bars as in Fig. 5. In the left panel, the line corresponding to L_150 MHz ≤ 10²¹ W Hz⁻¹ is omitted from the plot owing to its large error bars.