Anomalous HCN emission from warm giant molecular clouds

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Fig. 4

HCN J = 1–0 HFS-integrated line intensity ratios R₁₂ = W(F = 1–1) / W(F = 2–1) and R₀₂ = W(F = 0–1) / W(F=2–1) obtainedfrom our grid of models. Same details as in Fig. 2. Dashed curves are models that include line overlap and electron excitation with χ_e = 10⁻⁴ (see Sect. 4.6).

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