Investigating the abundances of H₂O on WASP-107 b’s evening and morning limbs. As in Sections 4.4 and 4.5, we performed a χ² comparison between our observed limb spectra and model spectra with varying H₂O abundance, focusing on NIRCam/F322W2. Panel (A) shows the evening-limb spectrum with all models consistent within the 68% confidence level, and panel (B) shows the same for the morning-limb spectrum. Panel (C) shows the full results of these tests, plotting the χ² value, relative to the minimum, as a function of the input H₂O abundance for both the evening- (orange) and morning-limb (blue) cases. The corresponding confidence intervals based on J. V. Wall & C. R. Jenkins (2012), are plotted as horizontal lines. For reference, we also show H₂O abundances previously inferred for WASP-107 b from the limb-combined spectrum in the literature.