Polarised flux density contours at λ3 cm smoothed to the λ6 cm resolution overlaid on a Hα image from the Wisconsin Indiana Yale National (WIYN) Observatory. Contour levels are at 100, 150, 200, 300, 400, and 500 μJy beam-1. In the lower left we show the size of the synthesised beam (12.̋5 × 11.̋7). The red vectors indicate the measured polarised flux density (1″ = 40 μJy beam-1) and the intrinsic magnetic field direction of the emission. The green cross marks the optical centre of M 82 and the blue ellipse the extent of the central optical disk.
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