Star-formation efficiency with H₂ (SFE_H2 and H₂ gas fraction f_H2 plotted against stellar mass (top panel); the analogous quantities but for H I (middle); and with total gas fraction f_gas (bottom). In all panels, the left-hand axis gives the SFE and sSFR units, while the right-hand one corresponds to gas fractions, both logarithmic scale. The binned medians for τ_H2 are shown by orange circles and f_H2 by open violet circles; the same quantities for H I are indicated by purple squares and open violet squares. Only bins with ≥5 data points are shown. Also plotted is the (binned) SFMS reported in Fig. 1, here shown by six-sided stars. Trends from Saintonge et al. (2016) are also shown by red curves as indicated in the legend in the lower left-hand corner. The shaded region correspond to ±1σ spreads of the binned parameters. The three M_star bins discussed in the text are delineated by vertical dashed lines.