Fig. A.4

6.7GHz methanol maser linear and circular polarisation fraction as a function of the maser luminosity. Colours indicate different degrees of preferred pumping (3, 10, 30, 100 times) for the hyperfine transition 4 → 5 A. The vertical dotted lines indicate gΩ = 10R. Magnetic field strength, angle θ, and thermalwidth are indicated in the plot.
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