Fig. 2.
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Map of total radio intensity at 4.85 GHz (λ 6 cm) of M 101 overlaid on the DSS blue map. The contours are 3, 5, 8, 16, 32, 64, 128, and 256 × 35 μJy beam−1. The vectors show the orientation of the magnetic fields and their length of 1′ is proportional to the polarised intensity of 0.17 mJy beam−1. The beam size of 30″ is shown in the bottom right corner of the map.
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