Left: gas fraction vs. M_star at different redshifts (in different colours according to the legend) for main sequence (MS) galaxies. Right: gas fraction vs. redshift at different M_star (in different colours according to the legend) for MS galaxies. Curves are obtained by interpolating the f_gas parameterizations reported in Fig. 10 and Table 1 and the MS relations (see text for details) at M_star above the minimum sampled M_star common to all SFR bins. Mean uncertainties on gas fraction associated to MS galaxies in each redshift (left) or stellar mass (right) bin are plotted.