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Fig. 4.

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Top:  12CO (6–5)/(1–0) intensity ratios as a function of HCN(1–0), HCO+ and HCO+(3–2) line intensities relative to  12CO(1–0). All ratios refer to a resolution of 22″, except the  13CO (6–5)/(1–0) ratios that refer to extrapolated 11″ apertures (cf. Sect. 4.3). The central and rightmost panels include linear fits to the data. Bottom: the same as the top row, but with  13CO lines substituted for  12CO lines. The dashed line in the rightmost panel is an eyeball fit to the limited data.

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