From top-left, clockwise: a) rest-frame (NUV − r) vs. (r − K) colour diagram (Arnouts et al. 2013); b) rest-frame (U − V) vs. (V − J) colour diagram (Williams et al. 2009); c) rest-frame colour (U − B) vs. stellar mass diagram. The red dotted line is the red sequence at z ~ 2 defined in Cassata et al. (2008). In all plots, small light grey dots represent the GMASS parent sample at z ≥ 1, while large points represent the final sample of 286 SFGs analysed in the paper. In particular: dark grey points indicate galaxies without IR data; salmon points indicate galaxies with a 24 μm detection; red points indicate galaxies with at least one PACS detection. The distribution of each quantity is shown by light grey histograms for the GMASS parent sample (#758), while dark grey histograms represent the distribution over the SFGs sample; salmon histograms represent galaxies with a 24 μm detection; red histograms represent galaxies with at least one PACS detection.