X-ray luminosity vs. UV luminosity for the full set of model SEDs for which the corona radius is physical (grey points; see Sect. 2 for more details). The black points correspond to the data obtained from Lusso et al. (2020) for quasars at a redshift below 2. The orange line shows the best-fit straight line fitted to the black points. The blue points correspond to the model SEDs that are consistent with the best-fit line within 2σ. The white diamonds indicate the data from the BASS sample (Gupta et al. 2024).