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Fig. 10


Left: rotation measure image calculated with the images at 1443, 1630, 4535, and 4885 MHz smoothed with a FWHM Gaussian of 19′′. The color range is from 60 to 60 rad/m2. Contours refer to the total intensity image at 1443 MHz. Levels are 1 (3σI), 5, 30, and 100 mJy/beam. Middle: burn law a in rad2/m4 calculated with the same images used to derive the RM. The image is derived from a fit of FPOL as a function of λ4 following the Eq. (5). The color range is from 500 to 1300 rad2/m4. Right: intrinsic polarization (Ψ0 and FPOL0), obtained by extrapolating to λ = 0 both the RM (Eq. (3)) and the Burn law (Eq. (5)).

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