Comparing various model scenarios to our observed limb spectra of WASP-107 b. Panel (A) shows the best-fit models of M. M. Murphy et al. (2024b), whom initially inferred an evening–morning temperature difference based on the NIRCam F322W2 spectra, extended to our wider wavelength range. We reduced the opacity of the F444W and MIRI points to emphasize that these data were not used in M. M. Murphy et al. (2024b). Panel (B) shows the best-fit models of L. Welbanks et al. (2024a), recomputed for the differing evening- and morning-limb temperatures. We find evidence for evening–morning variation in the abundances of SO₂ and CO₂ as well as a heterogeneous cloud distribution. The solid line in panel (C) shows the result of including these asymmetries, while the dotted line includes just the molecular asymmetries.