EE (left panels) and BB (right panels) power spectra from the HFI uncertainty maps described in Appendix A.1. The data points and error bars represent the mean and standard deviation of the power in each multipole bin computed over the 300 realizations for the LR42 (red) and LR71 (blue) sky regions. The dashed lines represent analytical fits (a power law plus a constant) to the data points. For comparison, the plots also present the spectra of the difference between half-mission maps (solid lines, labelled “HMD”).