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Fig. B.2
W49N: double sideband WBS spectra of four NO emission lines from the source itself. Each NO line consists of 3 hfs components, with quatum numbers 
(651 GHz), J = 6.5f → 5.5f (652 GHz), J = 7.5e → 6.5e (752 GHz), and J = 9.5e → 8.5e (952 GHz). The emission line at − 18 km s-1 blended with NO 651.433 GHz is SO 1111–1110.
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