Left: degree of polarization at λ6.2 cm (upper curve) and λ20.1 cm (lower curve) at a resolution of 25′′, determined from the average total and polarized intensities in rings of 0.5′ width in the plane of the galaxy (i = 31°, PA = 37°), as a function of radius. The polarization degree at λ6.2 cm becomes unreliable beyond 15 arcmin radius owing to the limited map size. Right: same for the average degree of synchrotron polarization. Values beyond 7′ radius are not shown because of the limitation of subtracting the thermal emission (see Sect. 3.2).
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