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Fig. 2
Observed spectrum of HD 27292 (dots) with a 12C18O line and a 13C16O line marked. The three synthetic spectra (solid lines) are for Teff = 4000 K and log g = 1.5 with 16O/18O = 300, 500, and 700 and 12C/13C = 15 and 30, respectively.
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