Stringent upper limits of minor species at the cloud top of Venus: PH3, HCN, and NH3

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Fig. 3

Map of the line depth of the CO₂ transition at 955.3069 cm⁻¹, recorded on July 16, 2023, corresponding to the spectrum shown in Figures 1 and 2. The low value at high northern latitudes is due to the fact that, in the polar collar, the temperature vertical profile becomes isothermal.

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