Molecular clouds at the edge of the Galaxy - I. Variation in the CO J = 2–1/1–0 line ratio

Open Access

Fig. 4

Correlations between R₂₁ and integrated intensities (a), linewidths (b), and peak temperatures (c) of CO lines. All 72 Galactic edge clouds are included in the calculations. The black and red points denote CO(1–0) and (2–1), respectively.

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