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Fig. 2

image

From top to bottom: N, J = 2, 3∕2 → 1, 1∕2 transition spectra of 13CH and CH near 1997 and 2006 GHz, in black with their corresponding Wiener filter fits to the spectra overlaid in red towards Sgr B2(M) (left) and G34.26+0.15 (right). Followed by their Wiener filter deconvolved spectra displayed in grey in optical depth scales. The 12CH spectrum towards Sgr B2(M) is contaminated by C3 absorption at 2004.833 GHz in the image band, as indicated in blue.

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