Fig. 6

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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