Fig. 13.

Distribution of the fraction of all carbon contained in CO. Left: results for an isotopological ratio of 40. Center: results for an isotopological ratio of 80; for comparison, the distribution for the ratio of 40 is shown as well (unshaded). Right: most probable distribution derived from both data sets (see text). Typically, one-third of the gas-phase carbon is in CO and two-thirds is in atomic or ionic form.
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