Distribution of quasars in the magnitude-redshift space for the BOSS radio-loud quasars (Pâris et al. 2014) inside the survey footprint. Whilst 551 radio quasars are detected in both the FIRST and LOFAR images (blue circles), LOFAR is able to detect a further 191 that are not detected in FIRST (red circles). The absolute magnitude in the i band at z = 2M_i(z = 2) is calculated using the K correction from Richards et al. (2006). The left and bottom panels show the M_i(z = 2) and redshift histograms.