Comparison between retrieved molecular abundances and equilibrium predictions. We created models in chemical equilibrium using FastChem (Stock et al. 2022, 2018) with a five times solar metallicity composition and where the vertical temperature profile is sampled from the retrieval. In the left panel, the curves and the shaded areas represent the median and 1 σ uncertainties of the mixing ratios of H₂O and OH from the equilibrium models. The points are the retrieved abundance for H₂O and OH, with their y height at the approximate pressure that they probe. In the middle, the line and the shaded regions are the median and 1 σ uncertainties on the (base ten) log ratio of OH/H₂O calculated from the equilibrium models. The point represent the log₁₀(OH/H₂O) calculated from the retrieval along with the associated 1 σ uncertainties. The point is at 1 mbar, which is the approximate pressure level where the observations probe. In the right panel, the contribution curves depict where in the atmosphere the signals of H₂O (blue) and OH (maroon) are probed. Curves are normalised so that their maximum is equal to one.