Fig. 1
Total intensity (I, upper panel) and circularly polarized intensity (V, lower panel) spectra for the CH3OH maser features G24.16, G24.23, G24.43, G24.52, G29.09, and G213.15 (see Tables A.1, A.3, and A.7). The thick red lines are the best-fit models of I and V emission obtained using the adapted FRTM code (see Sect. 3). The maser features were centered on zero velocity.
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