Fig. 1

Total intensity (I, top) and circular polarized (V, bottom) spectra for the two maser features IRAS 06.22 (left panel) and S255.30 (right panel), see Tables A.1 and A.3. The thick red lines are the best-fit models of I and V emission obtained using the adapted FRTM code (see Sect. 4). The maser features were centered to zero velocity.
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