Best-fit spectra and marginalized posterior distributions of the grid interpolation and free retrievals. First row: Exo-REM fit. Second row: ATMO fit. Third row: Sonora Diamondback fit. Fourth row: petitRADTRANS fit. Fifth row: Projected 1D posteriors for [M/H], C/O, ¹²C/¹³C, T_eff, log₁₀(g) and the radius R in the first to sixth column, respectively. For C/O, the posterior of the petitRADTRANS retrieval is shown twice because it was nominally calculated from the gas phase abundances only. For solar C/O, a ~ 25% reduction of gas phase oxygen is expected due to condensation (Sánchez-López et al. 2022), which we applied to the second, less opaque C/O posterior shown for petitRADTRANS. The last three rows show the posteriors obtained from considering the data’s 14 wavelength bands separately for the self-consistent grids, with the vertical dashed lines indicating the parameter grid values.