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

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Fig. 9

Disk-integrated TEXES spectrum of Venus (black points) between 951.55 and 951.85 cm⁻¹. Top: January 16, 2016; bottom: March 28, 2015. Green curve: The synthetic spectrum of Venus including the CO₂ line at 951.64 cm⁻¹. The blue horizontal line is the terrestrial atmospheric transmission, shifted by 0.03. Red curve: the synthetic spectrum of Venus including the NH₃ line at 751.776 cm⁻¹ with a vmr of 1 ppbv.

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