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Carbon monoxide has been detected in the Martian atmosphere by the appearance, in high-resolution interferometric spectra, of prominent lines of the 2-0 band of the principal isotope and weaker lines of other isotopes and of the 3-0 band. Quantitative analysis of the spectra results in a CO content of 5.6 cm Amagat, a surface pressure of 5.3 mb, and a CO concentration of 0.8 part per thousand by volume
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Kaplan et al. (1969) studied this question.
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