Distribution of the break frequency, ν_M, for 10⁴ sources with 5-GHz flux density of 10/1/0.1/0.01 Jy (see labels in figure); the r_M values correspond to the cases C2Co (black lines) and C2Ex (blue lines). In the two upper panels only model predictions corresponding to the flux densities of 0.01 and 0.1 Jy are shown; in the two lower panels, only predictions corresponding to 1 and 10 Jy are shown. In the lower panel on the left side we also plot the ν_M (red vertical arrow) of 3C 273 estimated by Clegg et al. (1983).