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Fig. 19

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TEXES spectra, integrated over the disk, recorded in the 1344.95-1345.30 cm-1 on Juanuary 12 (thick red line) and October 5 (thick black line). Data are compared with different models (thin lines): blue: SO2 = 150 ppb + cutoff (same model as in Figs. 14 and 15); Magenta: constant SO2 mixing ratio, SO2 = 35 ppb (same as in Fig. 15, thin black line). It can be seen that, for both observed spectra, a better fit is obtained when a cutoff is applied at 67 km. The drop of the signal on the October 5 TEXES spectrum is due to a strong telluric band. We note that the signal-to-noise of the October spectrum is not as good as in the January spectrum, due to poor atmospheric conditions. The discrepancy observed around 1345.1 cm-1 between the January data and the models is puzzling, and seems to be due to a continuum fluctuation.

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