Sample atmospheric models for WASP-69b in radiative and thermochemical equilibrium. Left panel: equilibrium temperature profile for two models with solar elemental metallicity and a solar C/O ratio (solid green curve) or a super-solar ratio (dashed blue curve). Middle panel: equilibrium composition for the respective solar C/O model (solid curves) and super-solar C/O model (dashed curves), colour coded for each relevant species (see legend). Right panel: post-produced HR transmission spectra over the GIANO-B wavelength range, for the solar C/O model (green) and super-solar C/O model (blue). The horizontal black lines denote the wavelength ranges where each of the labelled species significantly impact the spectra.