Extended Data Fig. 5: Retrieval contribution functions.
From: Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

Contribution functions integrated over the data point spectral bins, at each phase (a-d), and for each retrieval framework. These curves show the range of pressures probed by the observation according to the atmospheric models. The enhanced opacity from the water band around 7-9 μm makes these wavelengths probe lower pressures and hence colder temperatures, whereas the rest of the observing window probes higher pressures and higher temperatures.