Fig. B.3

NO emission from W49N in the line-of-sight o-NH2 absorption: normalised SSB spectrum of o-NH2. The emission line at 142 km s-1 is from NO at ν0 = 952.145 GHz. The NO ν0 = 952.464 GHz emission feature is seen at 47 km s-1 in the o-NH2 absorption. The two NO lines have similar line strengths. The red line shows the SSB normalised o-NH2 line without removal of the NO-line, and the green shows the spectra with removed NO-line.
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