The fraction of radio detected red galaxies (radio AGN) as a function of the stellar mass for the region shown in the upper panel of Fig. 11. Black stars show the fractions estimated in this paper for galaxies with L_{1.4 GHz}> 10²³ W / Hz. The errors shown on the black points are calculated from the equations given in Gehrels (1986). Blue diamonds show the fractions obtained for the NVSS sample by Best et al. (2005).