Overview of the results of our spectral fits for the target AF Lep b. The corner plot shows the retrieved posterior distributions for the main parameters – inferred or directly used as free parameters – for the seven differently colour-coded forward models considered in this study. The histograms on the diagonal are in log space along the y axis to enhance readability. The ten histograms in the upper-right corner show the posterior distributions of the molecules included as parameters in our free chemistry models. They also show the retrieved vertical profiles – depicted as 16th–84th percentile contour around the median – for each molecule in our chemical (dis)equilibrium models. The retrieved p–T profiles are shown as shaded areas in the centre right plot. The emission contribution functions associated to the spectra computed from the posterior median parameters are shown as dotted lines. At the bottom, we show the retrieved spectra compared to the archival data (upper plot) and our ERIS/SPIFFIER data (lower plot). The archival spectroscopic data are shown as colourful error bars, whilst the archival photometric data are shown as black error bars.