Molecular gas content of the 13 ALMA sources with CO emitter counterparts, obtained from 1.2 mm fluxes and CO(1–0) luminosities, respectively. Different α_CO values of 0.8 and 3.6 M_⊙ (K km s⁻¹ pc²)⁻¹ are adopted to convert the CO luminosities to molecular gas masses and marked as red and orange, respectively. The gas measurements by using the α_CO assigned for each source following Jin et al. (2021) are shown in blue dashed lines.