Emerging brightness temperatures (TbΔΩ) as function of the linear polarization fraction (Pl). The blue and red circles indicate the unsaturated and saturated masers, respectively, detected in NGC 7538 (Surcis et al. 2011a), W51, W48, IRAS 18556+0138, and W3(OH) (Surcis et al. 2012), IRAS 06058+2138-NIRS1, IRAS 22272+6358A, S255-IR, and S231 (this work). The red arrows indicate that the TbΔΩ values obtained from the adapted FRTM code are lower limits. The red full line is the limit of emerging brightness temperature above which the CH3OH masers are considered saturated (TbΔΩ > 2.6 × 109 K sr; Surcis et al. 2011a), and the dotted line gives the lower limit to the linear polarization fraction for saturated masers (Pl ≈ 4.5%, Surcis et al. 2012).
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