Consistency of our results using the four Planck component-separation algorithms. The data points shown in the upper panel represent the lensing B-mode band-power measurements obtained by cross-correlating the lensing B-mode template estimates using the Commander (red), NILC (orange), SEVEM (forest green), and SMICA (blue) cleaned polarization map with the corresponding B-mode map. The residuals with respect to the model in units of the 1σ band-power uncertainties are shown in the lower panel. The consistency of the four estimates strongly indicates the robustness of our baseline template against polarized foreground residuals, as discussed in Sect. 7.2.3.