Revisiting rotationally excited CH at radio wavelengths: A case study towards W51

Open Access

Fig. C.1

The ratio q_ij/q₀ as a function of t = kT/hν. The quantity q₀ is given by Eqn. C.3 in the text. Black curve: exact result. Red and blue dashed curves: behaviour (Eqns. C.2 and C.4) in the limits t ≪ 1 and t ≫ 1, respectively. Green curves: analytic fit in two parts (see text).

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