Right panels: comparison of the fully corrected MgII and Hβ lines in the mean composite quasar spectrum from SDSS data to the line profile predicted by 2.5D FRADO for cases corresponding to the mean quasar physical parameters (black hole mass of 10⁹ M_⊙, Eddington rate of 0.1) with metallicity of five times solar, viewed at 30 deg. Left panels: power-law-subtracted MgII and Hβ lines from SDSS data are decomposed into different components, as indicated in the plot legends.