EE (top panel) and BB (bottom panel) power spectra for synchrotron and thermal dust as computed from the Commander, SMICA, and 353 GHz frequency maps; see Planck Collaboration XI (2020) for algorithmic details. All spectra are evaluated outside the common polarization mask, over 78% of the sky. Dashed lines indicate the best-fit power-law fits for the Commander case, as reported in Table 6. Error bars indicate 3σ uncertainties. All spectra have been colour corrected to monochromatic reference frequencies of 30 GHz for synchrotron and 353 GHz for thermal dust emission, respectively.
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