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Table 4

CO line ratios and galactic environment.

Line ratio Global Central 45” Arm Interarm
12CO(2–1)/(1–0)
12CO(3–2)/(2–1)
13CO/12CO(1–0)

Notes. The CO (2–1) brightness temperature weighted mean line ratios and weighted 16th and 84th percentiles are given for different galactic environments.

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