SO2 transition at 1345.10 cm-1 (rest frequency, black thick line) compared with different models (thin lines): Green: SO2 = 100 ppb + cutoff (see text below); red: SO2 = 150 ppb + cutoff; blue: SO2 = 200 ppb + cutoff. Black: constant SO2 mixing ratio, SO2 = 50 ppb. The spike at 1345.09 cm-1 is an instrumental artefact ans was removed in the calculation of the line depth used to retrieve the SO2/CO2 map (Fig. 13, middle). It can be seen that the best fit is obtained when a cutoff is applied at 67 km.
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