Black line: spectrum of Mars recorded on January 24, 2017, in the southern region between 1387.9 and 1389.4 cm−1). Models: H2O = 200 ppmv, HDO = 280 ppbv (green); H2O = 250 ppmv, HDO = 350 ppbv (purple); H2O = 350 ppmv, HDO = 420 ppbv (blue); H2O = 350 ppmv, HDO = 490 ppbv (red, best fit). The surface pressure is 5.0 mb and the surface temperature is 260 K. The temperatures at altitudes of 0, 10, 20, and 40 km are 235, 215, 190, and 165 K, respectively. The airmass is 2.0.
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