This article has an erratum: [https://doi.org/10.1051/0004-6361/201629992e]
Parameter p0 (top) and slopes of the EE (middle) and BB (bottom) power spectra of stage b maps vs. the slope αM of the power spectrum of the turbulent component of the magnetic field (left) and vs. the relative strength of the turbulence fM (right). In the left plots fM = 0.8 and in the right plots αM = −2.5. Red stars (blue squares) represent results for N = 4 (N = 7). The abscissae of the two sets of points are slightly shifted from their original values for a better visibility. The values observed in the data are represented by a gray shaded region for αEE and αBB (a dashed line for the mean, dark, and light gray for the 1- and 2σ uncertainties) and by a hatched regions for p0 (a dashed horizontal line for the mean, and a red 45° (resp. blue −45°) hatched region for 1σ uncertainty for N = 4 (resp. 7)).
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