Overview of the MIRI MRS spectrum of Pluto, with atmospheric gas features identified (black). The light blue points show the Pluto fluxes from MIRI imaging photometry at a Pluto longitude of 342° E (Bertrand et al. 2025). Red curves indicate a model without atmospheric features. The model includes a solar component (blue) and a thermal component (green). Solid (resp. dashed) lines correspond to the diurnal-only (resp. CH₄ seasonal) case for surface temperature. The I/F reflectivity for the solar reflected component is shown in the inset. It indicates absorptions attributed to CH₄, CH₃D, and C₂H₄ ices.