Stellar mass vs. SFR at different redshifts for simulated SPRITZ galaxies with high-redshift extrapolation k_Φ = −1 (Eq. (2)). Blue shows the distribution of galaxies derived from the IR LF or the irregular GSFM, while red indicates the distribution of elliptical galaxies derived from the K-band LF. The colour gradients show the number of galaxy in 1 deg² and these are in logarithmic scale, as shown on the right for star-forming galaxies (top colour bar) and ellipticals (bottom colour bar). The different lines show the observed position of normal star-forming galaxies as derived by Elbaz et al. (2011, dash-dot-dot-dotted green line), Speagle et al. (2014, dotted black line), Caputi et al. (2017, dash-dot-dotted yellow line), Santini et al. (2017, dash-dotted light green line), Bisigello et al. (2018, dashed orange line), and the relation derived for SBs by Caputi et al. (2017, pink dash-dot-dotted lines) and Bisigello et al. (2018, magenta dashed lines).