Retrieved vertical profiles of Luhman 16A (solid) and Luhman 16B (dashed). Left panel: chemical abundances and the 68, 95, and 99.7% confidence envelopes of each species for both brown dwarfs. The dotted lines show the chemical-equilibrium abundances computed with FastChem (Kitzmann et al. 2024). With the exception of FeH, the modelled abundances are constant with altitude and thus do not show the drop-offs exhibited by the equilibrium profiles. Middle panel: inferred temperature profiles and the condensation curves (dotted) of four cloud species (Visscher et al. 2006, 2010). Right panel: grey-cloud opacities retrieved as a function of altitude. The orange and blue shading in the panel gaps indicate the Luhman 16AB photospheres as obtained with the integrated emission contribution functions.