Histogram of the redshift distribution between the radio AGN in the 3 GHz VLA-COSMOS sample and the S³-SEX semi-empirical simulation (Wilman et al. 2008) for a sky area of 20 × 20 deg² centred at the central coordinates of the simulation, and for a flux density limit of 17 μJy. The total area of the histogram bars is normalised to unity. Solid histograms correspond to 3 GHz data and semi-filled to the simulation. The bin size is 0.2. Red shows FRII, green shows FRI/FRII, blue shows FRI, and black shows COM AGN or GPS.