6.7 GHz methanol maser linear and circular polarisation fraction as a function of the maser luminosity for five different θ. The vertical line marks T_BΔΩ where gΩ = 10R. Magnetic field strength is 1 and 100 mG, thermal velocity width is 1 km s⁻¹ and the hyperfine transitions are indicated in each panel. The panel at the top left labelled “baseline” indicates a fixed pumping rate equal for all the hyperfine transitions, while all others assume a 10× preferred pumping for the indicated i → j transition.