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Fig. B.4
Leftpanel: map of the CH+ J = 1–0 to [C II] 158 μm line intensityratio (in units of W m−2 sr−1) roughly proportional to gas density variations at the irradiated cloud surfaces. Right panel: map of the HCN J = 6–5 to HCO+ J = 6–5 line intensityratio. In both maps contours represent the 13CO J = 2–1 optically thin emission.
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