WASP-96 b’s morning and evening limb transmission spectra as observed with JWST. Top: the morning-limb transmission spectrum (blue data points) compared to the evening limb spectrum (faded red). Overplotted in purple is the morning-limb spectrum from the aerosol-free, 10× solar UM GCM run (see Appendix C). Blue and gray shaded rectangles denote the in-band and out-of-band wavelengths, respectively, for the H₂O and CO₂ band amplitude calculations (see Section 5.1). Middle: inverse of the above, focusing on the evening limb spectrum. Bottom: fitting midtransit time as a function of wavelength assuming a uniform-limb (i.e., batman) planet (black points). In green is the T₀ spectrum derived from the asymmetric catwoman fits using the formalism of M. M. Murphy et al. (2024a).