Fig. 4
Map of the HDO/CO2 line depth ratio derived from the 1350.30 cm-1 HDO line and the 1350.40 cm-1 CO2 line (Doppler-shifted frequencies). Left: January 10, 2012; right: January 12, 2012. The subsolar point is indicated with the white spot. A depth ratio of 0.4 corresponds to a H2O mixing ratio of 1.5 ppm, assuming a D/H ratio of 200 (see text, Sect. 3.4).
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