Infrared LFs used in the SPRITZ simulation to derive simulated galaxies. Each panel shows a different galaxy population, as indicated on the top left. The LFs are shown for different redshifts from 0.1 (solid dark blue line) to 9.6 (solid dark red line) with steps of 0.5. At z > 3 we show the LFs derived assuming k_Φ = −1 (see Eq. (2)) for all the populations except for AGN1 and AGN2 for which observations up to z = 5 are available.