IRX–M_⋆ relation for star-forming main sequence galaxies extracted at z = 1.5. The blue density shows the complete sample. The dashed gray lines show the median relation. The solid gray line shows the mean relation computed using IRX = ⟨L_IR⟩/⟨L_UV⟩, to be consistent with what is measured by stacking. Around the median relation, the dotted gray lines indicate the 15% and 85% quantiles of the distribution. We compare our predictions with observational measurements from Pannella et al. (2015; orange pentagons), Heinis et al. (2014; yellow squares) and Whitaker et al. (2014; solid red line).