Infrared excess luminosity (erg s^-1) versus (left panel) rest-frame FIRST radio luminosity (erg s^-1) and (right panel) spectral index from 8 to 24 μm estimated from the IR excess in the SED above the stellar emission (right panel). 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 the filled ones. The radio-IR correlation is the dashed line, and its parameters are shown in Table 6.