Fig. 16
Rotational population diagrams for A-CH3CN computed with a non-LTE excitation code. All models adopt the same gas temperature (Tk = 150 K) and column density (Ntot = 5 × 1011 cm-2), but three different n(H2) values. For simplicity, only rotational transitions in the Ka = 0 (filled symbols) and 3 (empty symbols) ladders are shown.
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