Rms of the combined reconstruction residuals for E and B modes (left and right columns, respectively) determined from the purified inpainting of the FFP10 simulations for all four component-separation methods (i.e., the average of the square of each of the four residuals). The grey area represents the common polarization mask, while the semi-transparent grey area indicates an expansion of the confidence mask, which together admit 65% of the sky for further analysis. The mask increment is determined from thresholding the total residual δE² + δB², smoothed by an 80′ FWHM Gaussian. The rms reconstruction accuracy is better than 0.5 μK, with the largest deviations mainly localized near the mask boundary.