Luminosity function at 8 μm for all galaxies simulated with SPRITZ (solid black tick line), with high-redshift extrapolation k_Φ = −1 (Eq. (2)). The grey area shows the uncertainties due to the high-z extrapolation and 1σ errors of the GSFM, IR, and K-band LFs used to generate simulated galaxies. The LF for the different sub-populations is also shown: spirals (green line), SBs (cyan line), the two composite populations SF-AGN (dark green line) and SB-AGN (orange line), AGN type-1 (blue line), AGN type-2 (magenta line), elliptical galaxies (red line), and irregular galaxies (brown line). The observed 8 μm LFs by Rodighiero et al. (2010, red squares), Caputi et al. (2007, blue circles), Goto et al. (2015, 2019, green triangles), and Magnelli et al. (2011, light blue stars) are also represented.