Fig. 2
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Daytime (SZA = 0°) vibrational temperatures of the main CH4 energy levels contributing to the 3.3 μm radiance as a function of pressure. The p-T1 kinetic temperature profile, the VMR1 abundance profile, and the nominal collisional rates of Table 1 were used. The major CH4 isotopologue is labelled ‘61’ and the second is labelled ‘62’.
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