Machine learning retrieval outputs for legacy model grids. From left to right: COOLTLUSTY from Hubeny & Burrows (2007), BT-Settl by Allard et al. (2012), and Sonora Diamondback by Morley et al. (2024). The HST exposures cover data from 2018 (66) and 2020 (165), where the x-axes are broken to fit the two epochs of data. Each orbit consists of 11 intra-orbit spectra. Posterior median values are indicated as black dots, while the corresponding error bars are shown in green. The represented reduced chi-square values correspond to a fit of a straight line through all posteriors of a given parameter.