Total extrapolated molecular gas mass, M_H2,tot, as a function of morphological type. Galaxies classified as MOHEGs (H₂/7.7 μm ≥ 0.04) are shown as large red circles, non-MOHEG galaxies with 0.01 < H₂/7.7 μm < 0.04 as smaller blue circles, galaxies with H₂/7.7 μm < 0.01 as black dots and galaxies with no warm H₂ data are black crosses. The green symbols denote means (triangles) and medians (squares) for a sample of isolated galaxies (Lisenfeld et al. 2011). The mean, respectively median, are taken for the interval of morphological types shown by the horizontal bar.