Top panel: variation in the band depth (in %) with longitude for the five stronger CH₄ absorption bands measured from the spectra of Pluto presented in this work. Bottom panel: variation in the depth of the absorption bands at 1.14, 1.72, and 2.32 μm from G13. The points in the gray shadow represent replicate values (at longitude ± 360°) to better visualize the variation in the band depth with the longitude.