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Fig. 2

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Left: velocity-integrated intensity ratios CO(3–2)/CO(1–0) in the CND as well as in the SB ring. Right: CO(6–5)/CO(3–2) and CO(2–1)/CO(1–0) in the CND. The filled ellipses represent the spatial resolutions used to derive the line ratio maps: 2′′ × 1.1′′PA = 22° for CO(3–2)/CO(1–0) and CO(2–1)/CO(1–0); 0.6′′ × 0.5′′PA = 60° for CO(6–5)/CO(3–2).

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