Fig. 14
Variation in the excitation temperatures of the 3.264 GHz (dark blue), 3.349 GHz (dark orange), and 3.335 GHz (red) ground-state transitions of CH as a function of gas densities at Tkin =75 K, N(CH)= 3 × 1014 cm−2 and Δυ= 6 km s−1. The dashed grey line marks 0 K while the inset panel expands between n = 1 × 103 and 1 ×105 cm−3.
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