Left: polarized emission (contours) and observed B vectors (E+90°) of the central and north-western regions of IC 342 at λ6.2 cm (VLA only) at 15′′ resolution, overlaid onto a greyscale presentation of the infrared map at 8 μm from the IRAC camera of the Spitzer telescope at 2′′ resolution (Fazio et al. 2004). Right: polarized emission (contours) and observed B vectors (E+90°) of the central and north-western regions of IC 342 at λ20.1 cm (VLA only) at 25′′ resolution, overlaid onto a greyscale presentation of the same infrared map at 8 μm. Faraday rotation and depolarization are strong at this wavelength. The northern and western parts of the galaxy are not shown here because the emission is mostly depolarized.