Observed SFR – stellar mass relationship at various redshifts, compared to the models (solid line with the same symbols as in Fig. 1). Blue dashed lines (D08): observational trends reported by Davé (2008) on the basis of Elbaz et al. (2007) and Daddi (2007). Dotted line (B04): Brinchmann et al. (2004). Crosses (B08): Buat et al. (2008). Magenta long-dashed lines (S09): Santini et al. (2009).