Rest-frame monochromatic luminosities log L_X against log L_UV for the 30 quasars in our z ≃ 3 sample. The colour coding is the same as in the previous figures. The green dots represent the sample of ∼2400 quasars from L20, with the relative regression line. The dashed lines trace the 1σ dispersion, 0.23 dex. We overplotted the sample of typical quasars from Timlin et al. (2020), where sources with an available C IV measurement are highlighted with a blue circle.