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Fig. 3.


Top: map of the line depth of the weak CO2 transition at 955.3069 cm−1, corresponding to the observations from March 28, 2015, shown in Figs. 2 and 3. Bottom: map of the PH3/CO2 line depth ratio. The subsolar point is shown as a white dot. The negative values on the map of the CO2 line depth (top) indicate a different behavior of the temperature profile at the level of the polar collar at high southern latitudes.

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