Total radio emission at 5.99 GHz (VLA + Effelsberg), overlayed on optical Digitized Sky Survey image (blue band). The angular resolution is FWHM. The intrinsic magnetic field orientation (line segments of equal length) were obtained with RM-synthesis at pixels where the polarized intensity is larger than 5σ, where σ is the rms noise in Stokes Q & U (refer to Paper II). Contour levels of the total power emission are at 45 μJy beam⁻¹ × (3, 6, 12, 24, 48, 96, 192, 384). The dwarf elliptical companion NGC 4627 can be observed in the northwestern quadrant of the galaxy. The triple radio source mentioned in Sect. 1, can be distinguished in the central region of the galaxy (eighth contour).