Column-density-averaged abundance of oxygen in water vapour (H₂O), water ice (s - H₂O), atomic oxygen (O), carbon monoxide (CO), carbon-oxygen ices (s - CO^∗; these are s-CO, s-CH₃OH, s-H₂CO, which are the three most abundant molecules from the group of carbon-oxygen ices after the dark cloud phase), and other species in the water freeze-out zone for a post-collapse time of 0.1 Myr. The initial conditions (Table B.1) are shown in the left bar. This figure contains the results from the chemical models of V11, A13, and W13, which are discussed in Appendix B.