Fig. 5
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Top: integrated line intensities of 13CO versus 12CO isotopes for the (1–0) transition. Bottom: integrated CO line intensities of the C18O versus 13CO isotopes for the (2–1) transition. Green full lines correspond to linear relation for which the slope is the median WCO ratio; dashed lines give 1σ errors from the 16 and 84 percentiles.
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