Left panel: distribution of the rest-frame total radio luminosity (in erg s^-1 Hz^-1) at 1.4 GHz from the FIRST data (upper panel) and NVSS data (lower panel). The dashed lines correspond to the local FR I/FR II break used to separate the sample in HP and LP sources. The FR IIs distribution is represented by the back-slash shaded histogram. The dashed histogram represents the entire COSMOS RL AGN sample at high redshifts. Right panel: redshifts versus the rest-frame FIRST radio luminosity at 1.4 GHz (in erg s^-1 Hz^-1). The empty points are the LPs, and the full points are the HPs. The FR IIs are the triangles. The red squared points represent the sample studied by B13: LPs are the empty points and HPs the filled ones. The solid line represents the luminosity-redshift relation corresponding to the flux limit of the FIRST survey (between 1−0.6 mJy but we use 0.75 mJy for the plot.)