The Irac3 versus H−Irac3 colour–magnitude relation (left-hand panel) and the J−H versus H−Irac3 colour–colour relation (right-hand panel) at z= 2 for the run with the M05 models (cyan dots) and for the run with M05 models + nebular emission (as in Molla' et al. 2009; yellow triangles), compared with the GOODS-S catalogue (Daddi et al. 2007). The highlighted squares represent galaxies with SFR > 70 M⊙ yr−1 in both runs. We are only plotting the model galaxies with reddening, for clarity.