SFR-M_* diagrams defined by the different samples considered in this paper (left panel): full CALIFA (cyan hexagons), and galaxies observed in CO lines by APEX (red circles), CARMA (yellow diamonds), CARMA (D+E galaxies only, empty green diamonds), ACA (blue squares). In the right panel, the red circles represent CO-detected galaxies (with S/N > 3), while the black dots show CO non-detections (with S/N < 3). In both panels, the black line shows Cano-Díaz et al. (2016) the SFMS model with the uncertainties (dotted lines). The dashed purple line indicates the green valley boundary position defined in C20, which is located 3σ (equal to 0.20 dex as in Cano-Díaz et al. 2016) from the SFMS. APEX targets extend from the SFMS to the retired regions, better representing the CALIFA galaxies in this diagram.