CO emission as a function of the AGN-SFR contrast. ratios as a function of the contrast between the AGN and star formation contributions to the total IR budget for CO (5 − 4), CO (7 − 6), and CO (2 − 1) (from left to right). The symbols mark our sample of galaxies at z ∼ 1.2 and galaxies from the literature (Boogaard et al. 2020; Liu et al. 2021) as in previous figures, color coded according to f_AGN. Vertical arrows mark 3σ upper limits on , and horizontal arrows show the floor of f_AGN that we considered for the high-redshift galaxies. Blue open symbols indicate X-ray detections. The solid blue lines indicate the projection of the best-fit plane models with fixed null intercept in the 3D space of L_IR,  SFR, L_IR,  AGN, and for CO (5−4) (Eq. (2)) and CO (7 − 6). The solid purple line in the left panel indicates the projection of the best-fit model for AGN hosts with f_AGN + 1σ_fAGN > 20% or X-ray detected. The absence of points with L_IR,  AGN/L_IR,  SFR > 1 in the central panel is due to the lack of CO (7 − 6) coverage.