Fig. 15
Left panel: rmsmin/rms ratio as a funtion of Tk and n(H2) for a grid of LVG models. The best fit models were obtained with Tk = 150–250 K and n(H2) = (0.7–1.7) ×105 cm-3. Right panel: observed C2H N = 3 → 2 and 4 → 3 spectra. The best fit LVG model (Tk ≃ 150 K, n(H2) ≃ 1.5 × 105 cm-3, and N(C2H) = 4.2 × 1014 cm-2) is shown overlaid in red.
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