Polarized emission (color) of the Toothbrush relic in 1RXS 06+42, overlaid with total intensity contours, from observations at the Westerbork Radio Synthesis Telescope (WSRT) (van Weeren et al. 2012). Vectors depict the polarization B–vectors, not corrected for Faraday rotation, with lengths representing the degree of polarization. The beam size is 22″ × 34″. Left: 1.38 GHz map. Total intensity contours are drawn at levels of [1, 2, 4, 6, 8, 16, 32] × 1 mJy/beam. A vector length of 1′ corresponds to 20% fractional polarization. Right: 4.9 GHz map. Total intensity contours are drawn at levels of [1, 2, 4, 6, 8, 16, 32] × 1 mJy/beam. A vector length of 1′ corresponds to 75% fractional polarization. The rms noise increases with increasing distance from the center of the primary beam which is obvious at the eastern edge of the map.