Natural-weighted JVLA image of NGC 628 of total intensity (top) and linearly polarised intensity (bottom) at 3.1 GHz at a resolution of 18″, averaged over all channels. Contours of total intensity are at 1, 2, 4, 8, 12, 16, 32 × 20 μJy/beam. Contours of polarised intensity are at 1, 2, 3, 4, 8, 12 × 15 μJy/beam. The lines show the magnetic field vectors (E + 90°), not corrected for Faraday rotation, with a length of 10″ representing a polarised intensity of 150 μJy/beam (top) and 30% degree of polarisation (bottom), respectively. The roman numerals I and II refer to the H I holes shown in Fig. 7.