Left: Phase space diagram. Objects are color-coded by their molecular to stellar mass ratio μ_gas offsets with respect to the scaling relation of Tacconi et al. (2018). Solid grey lines divide the phase space into three regimes with galaxies being in the outskirts (η ≥ 2), infalling (0.4 ≤ η ≤ 2) or central regions (η ≤ 0.4) similarly to Pérez-Martínez et al. (2023). CO(1−0) measurements at S/N > 4 are depicted as solid circles while inverted triangles show upper limits. Right: Molecular to stellar mass ratio (μ_gas) offsets from the scaling relation as a function of the environmental parameter η. In addition, the pentagon and two hexagons depict the three stellar mass and AGN activity bins presented in Table 2. The remaining symbols and colors remain the same as in the left-hand diagram.