Radio-loudness, using 6 μm luminosity as a proxy for accretion luminosity, plotted against λ_Jet for the mass-complete compact (circles) and complex (squares) radio AGN (light red), star-forming galaxies (grey upper limits), those radio AGN also detected in X-rays (green), and those that have secure FRII morphologies (black crosses) or are giant radio galaxies (stars). It can be seen that sources with log(λ_Jet)≳ − 3.0 are almost exclusively “radio-loud”.