Gas depletion time τ_dep = M_mol/SFR as a function of redshift for the SS, HI-FR and the COLDGASS sample. The yellow line gives, for illustration, the relation of τ_dep ∝ (1 − z)^−0.6 from Tacconi et al. (2018), and the gray line is the fit to our data (τ_dep ∝ (1 − z)^−0.02). The blue diamond is the mean value of the xCOLDGASS galaxies that lie on the SFMS and the brown diamond is the mean value of the HI-FR sample. The errors of both means are smaller than the symbol size.