NGC 4013 combined (C- and D-configuration) C-band polarized intensity from Fig. 11, but smoothed to a beam size of 18″ × 18″ with a σ of 8.6 μJy beam⁻¹. Apparent magnetic field orientations are shown in light grey, where the polarized intensity is at the 2.5σ level or higher, black apparent magnetic field orientations are shown for polarized intensity of 5σ level or higher. Stokes I intensity contours of C-band are displayed in white at 3 and 64σ levels with a σ of 13 μJy beam⁻¹ obtained with an uv-taper of 12 kλ and Gaussian smoothing. The yellow contours of the L-band Stokes I intensity obtained with an uv-taper of 18 kλ and Gaussian smoothing are displayed at 3σ level with a σ of 50 μJy beam⁻¹. The orange contours represent the Stokes I intensity of LOFAR at 3σ with a σ of 204 μJy beam⁻¹.