Fig. 8
LVG models for 13CO and HCN peak temperatures as a function of normalized column density and volume density. We adopted abundances [13CO]/[H2] = 2 × 10-6 and [HCN]/[H2] = (2–20) × 10-8. The green lines trace the contours of 13CO peak intensity, while the red lines trace the contours of HCN peak intensity. Dotted black lines are where solutions are coincident.
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