Upper panel: evolution of sSFR in main-sequence galaxies of 5 × 10⁹  M_⊙. Lower panel: evolution of the characteristic density φ_b of the mass function with redshift. Both panels: model A (B12 model) is represented with a solid line and model B (modified version with higher sSFR and lower density at high redshift) with a long-dashed line. We use the compilation of data points of Sargent et al. (2012).