Spectrum of Venus recorded by TEXES on October 5, 2012 (20:10 UT), integrated over the whole disk, between 529.1 and 530.6 cm-1 range (black line). The spectral resolution is 0.010 cm-1. Models: CO2 (blue), SO2 (100 ppb, red). Three weak SO2 lines are detected around 529.32, 529.7 and 529.95 cm-1. It can be seen that the observed lines are broader than the modelled ones, while the weak CO2 lines are well fitted by the model. This suggests that the SO2 mixing ratio decreases as the altitude increases (see text).
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