Basic properties of the QSO mock. Top: output Lyα LF of the QSO mock at z > 2. The measurement of the Lyα line can often be affected by the presence of the N V line, for this reason we also show the Lyα+N V LF. The bias correction in the L_Lyα measurement caused by N V is addressed in Sect. 4.2. We compare with the fits for the QSO Lyα LF in Spinoso et al. (2020) and Zhang et al. (2021), using a Schechter and a double power-law, respectively. Bottom: L_Lyα as a function of r magnitude for the sources in the QSO mock (orange) and the QSOs of SDSS DR16Q with a L_LyαS/N > 5 (blue). The contour lines mark the regions containing the 68% and 95% of the objects.