Fig. 6
Top left panel: map of the HCO+ 6–5/3–2 intensity ratio, at 43′′ resolution, sensitive to gas density variations. Bottom left panel: map of the CO 10–9/2–1 intensity ratio, at 27′′ resolution, sensitive to gas temperature variations. In both maps the white contours represent the 13CO J = 2–1 optically thin emission. Right panel: grid of non-local and non-LTE excitation models and predicted line intensity ratios.
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