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Methane and its isotopologues on Saturn from Cassini/CIRS observations

Fletcher, L. N.; Irwin, P. G. J.; Teanby, N. A. +2 more

High spectral resolution observations from the Cassini Composite Infrared Spectrometer [Flasar, F.M., and 44 colleagues, 2004. Space Sci. Rev. 115, 169-297] are analysed to derive new estimates for the mole fractions of CH ₄, CH ₃D and ¹³CH ₄ of (4.7±0.2)×10, (3.0±0.2)×10 and (5.1±0.2)×10 respectively. T…