Molecular gas-mass function derived from the observed group at z_spec = 1.284 compared to works in the literature by (Decarli et al. 2019, 2020, D19 and D20, at 1.0 < z < 1.7), (Lenkić et al. 2020, L20, at 1.2 < z < 1.7), and (Messias et al. 2024, M24, at 1.0 < z < 1.8). The results by Berta et al. (2013, different line types for different redshift ranges) were derived from empirical scaling relations, instead of inferring M_H2 from CO as the previously cited works. The empty boxes show the results from our study. These are 0.5 dex wide in molecular gas mass (centred at each step of 0.25 dex), and the vertical width shows the statistical uncertainty.