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Fig. 9

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MOLPOP-CEP model constrained brightness temperature (in red) to the emission and absorption components observed in the N, J = 1, 3/2 → 1, 1/2 transitions of CH near 532 GHz (upper panel) and 536 GHz (lower panel), respectively, towards W51 E. The pink and blue shaded regions indicate the fits to only the emission and only the absorption components, respectively.

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