H₂ density of this study (the red star) compared to results from COLDz (Riechers et al. 2019), ASPECS (Decarli et al. 2020), and PHIBSS2 (Lenkić et al. 2020) overlaid by the fitting of field galaxy samples from Liu et al. (2019) and Lagos et al. (2020). Gas density in galaxy clusters from simulations are shown via gray curves for SHARK (Lagos et al. 2020) in two volumes, and a gray diamond with a bar for DIANOGA (Bassini et al. 2020), respectively. The gray diamond with the error bar shows the median, and the downward triangle marks the maximum values for cluster structures in DIANOGA simulations. The gas density in this work is significantly higher than observed in blank fields and also higher than predictions for clusters in simulations.