Fraction of cold molecular gas as a function of the galaxy stellar mass. The colours and shapes of the markers are the same as in Fig. 6. The dotted line is the fit of the M_star–μ_H2 relation at z ∼ 0.45 and derived from the relation for the PHIBSS2 galaxies at z ∼ 0.5, with its dispersion being represented by the two dashed lines. The pink outlined green markers are for the CL1301 low-μ_H2 galaxies located below the 1 × σ_H2 line of the M_star–μ_H2 relation for the PHIBSS2 field galaxies.