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Fig. 3

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Velocity-integrated intensity ratios HCN(4–3)/HCN(1–0) (left) and HCO+(4–3)/HCO+(1–0) (right) across the CND as well as in the SB ring. The filled ellipses in the lower right corners represent the spatial resolutions used to derive the line ratio maps: 6.6′′ × 5.1′′ PA = 157°, for both panels.

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