Cross-correlation of our B-mode template with the SMICA polarization map using masks of different levels of conservatism. The data points show the lensing band-powers estimated using masks that preserve a sky fraction of about 60% (labelled B60), 70% (“B70”), and 80% (“B80”), and that are targeted to the foreground emission in temperature (see Sect. 7.2.1); as well as using the 68% “B70s” mask, which allows for a more conservative masking of the extragalactic objects (see Sect. 7.2.2), and the 68% polarization-targeted “B70p” mask (see Sect. 7.2.3). The residuals with respect to the model in units of the 1σ band-power uncertainties are shown in the lower panel. The good agreement of all cases within error-bars provides a robustness test against foregrounds, as discussed in Sect. 7.2.