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Fig. 2


Cassini/CIRS limb spectra acquired at two different tangent pressure levels at 80°S (in black, with 1σ error bars). Best-fit synthetic spectra are overplotted, corresponding to the retrieval of the CO2 mixing ratio alone (in green, no benzene opacity) or to the simultaneous retrieval of CO2 and C6H6 mixing ratios (in blue and red, assuming different C6H6 vertical distributions shown in Fig. 4, same colour code). Wavenumbers contaminated by an electrical noise spike are omitted in the analysis.

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