Comparison of observed (dots) and synthesized spectra (lines) of Arcturus for different O ratios. Dotted line: 12C/13C = 9 and 17O/16O = 18O/16O = 0; continuos line: the same 12C/13C with 17O/16O = 3030, 18O/16O = 1660. Note that the cores of the more intense CO lines are not reproduced by the theoretical spectrum (see text). Some of the C17O and C18O lines used are marked.
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