SFR versus molecular gas masses for the QSO2s, shown as circles of the same colors as in Fig. 2. Average errors are indicated in the bottom right corner. Dotted, dashed and dot-dashed lines correspond to constant depletion times of 10⁸, 10⁹, and 10¹⁰ yr. Data from different samples are shown as follows: ATLAS^3D are red diamonds, COLD GASS are blue/purple squares (disk/bulge-dominated galaxies), type-1 QSOs from Husemann et al. (2017) are triangles of the same colors as our QSO2s (orange=bulge-dominated, yellow=disk-dominated, light turquoise=major mergers), and QSO2s from Jarvis et al. (2020) are open circles.