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Fig. 4


Amplitude of the dust AEE (red squares) and ABB (blue circles) power spectra, normalized with respect to the largest amplitude for each mode. These are plotted versus the mean dust intensity I353 for the six LR regions (top panel). A power-law fit of the form AXX(I353)= KXXI3531.9, X ∈ { E,B }, is overplotted as a dashed line of the corresponding colour (these almost overlap). The bottom panel presents the ratio of the data and the fitted I3531.9 power law; the range associated with the ± 1σ uncertainty in the power-law exponent of 1.9 is shown in grey. For details see Sect. 4.3.

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