Frequency dependence of the amplitudes AEE,BB of the angular power spectra, relative to 353 GHz (see details in Sect. 4.5). Results for (red squares) and (blue circles) for the smallest region, LR24. These include evaluations from cross-spectra involving polarization data at two frequencies, plotted at the geometric mean frequency. The square of the adopted relative SED for dust polarization, which is a modified blackbody spectrum with βd = 1.59 and Td = 19.6 K, is shown as a black dashed line. The ± 1σ uncertainty area from the expected dispersion of βd, 0.03 for the size of LR24 as inferred from Planck Collaboration Int. XXII (2015) (see Sect. 2.2.1), is shown in grey.
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