Fits of the Spitzer 2004 (black points at top) and Herschel 2012 (all other points) brightness temperatures of the Pluto-Charon system using a diurnal-only model. Thin dotted lines: Spitzer-derived model (case 1 in Table 2). Dashed lines: Spitzer-derived model with CH4 emissivities adjusted (case 2). Solid lines: new model (see text), assuming that radiation originates at the surface at all Herschel wavelengths (case 4). Dashed lines: same, but assuming that radiation originates in the subdiurnal layer at all Herschel wavelengths (case 5).
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