UV luminosity (erg s^-1) measured at 2000 Å  versus (left panel) rest-frame FIRST radio luminosity (erg s^-1) and (right panel) infrared excess luminosity (erg s^-1). Black empty points are LPs, while filled black points are HPs. The FR IIs are the black triangles. The red squared points represent the sample studied by B13: LPs are the empty points and HPs are the filled ones. The dashed lines represent the linear correlations, whose parameters are reported in Table 6.