Molecular gas fraction, f_molgas, (Equation C.3) as a function of stellar mass as inferred from the Band-7 dust continuum based on Equation C.1. The points are colour-coded by their classifications described in Section 3. The empty circles represent upper limits. The median gas fraction of the CRISTAL sample is ∼ 0.5. Our measurements are in broad agreement with those reported by Dessauges-Zavadsky et al. (2020) for the ALPINE samples (purple hexagons), in which we both observe a similar slope of dependence of f_molgas on M_⋆, similar to that of the lower redshifts 1≲ z ≲6 star-forming galaxies compiled by Dessauges-Zavadsky et al. (2020) and references therein (light grey to blue markers).