Decomposed CRRL profile in blue alongside the 70 GHz HFS stacked CH2 line profile displayed by the dashed-dotted violet curve toward (clock-wise from top) W51 M, W49 N, DR21, and W43, respectively. The stacked profile of the 70 GHz CH2 transition was obtained from the HFS decomposition model. The hatched grey regions in the W51 M and W49 N spectra display the line profiles of the 3 P1 − 3 P0 transition of CI at 492.160 GHz scaled down by a factor of 125 on the Tmb scale.
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