Constraints on the power law model β_ν = β₀(ν/ν₀)ⁿ for nearly full-sky f_sky = 0.93. The green contour shows the probability distribution when we ignore the intrinsic EB of the foreground, while the blue contour shows that with the filament model for the foreground. The quoted values are for ignoring the EB correlations of the foreground. The equivalent values using the filament model for dust EB are β₀ = 0.33° ±0.12° and .