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Fig. 2.

image

Opacities of 12C16O (blue) and 13C16O (orange), shown at T = 1200 K and P = 10−4 bar, which are representative values for the pressures and temperatures probed by CO lines at high resolution, in HD 179949b. The opacities have been scaled such that 12C16O constitutes 98.7% and 13C16O 1.1% of all CO molecules.

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