Morning- and evening-limb transmission spectra of HAT-P-1 b derived from the JWST NIRSpec G395H observation. Blue points show the evening-limb spectrum and orange points show the morning-limb spectrum, with 1σ uncertainties. The two limb spectra are broadly consistent across the G395H bandpass, with no clear wavelength-dependent offset or coherent detector-wide difference. This lack of a significant G395H limb contrast is consistent with expectations from G. Fu et al. (2025a), which predicts only a modest morning–evening difference for HAT-P-1 b and identifies the NIRISS SOSS 1.4 μm H₂O band as the more sensitive cue for the population-level limb-asymmetry trend.