Left: WSRT 4.9 GHz polarization E-vector map. Total polarized intensity is shown as grayscale image. Vectors depict the polarization E-vectors, their length represents the polarization fraction. The length of the E-vectors are corrected for Ricean bias (Wardle & Kronberg 1974). A reference vector for a polarization fraction of 100% is shown in the bottom left corner. No vectors were drawn for pixels with a SNR < 3 in the total polarized intensity image. Contour levels are drawn at  [1,4,16,64,...]  × 3σ_rms and are from the Stokes I image. The beam size is 7.0″ × 4.7″ and indicated in the bottom left corner of the image. Right: WSRT 1382 MHz polarization E-vector map made with natural weighting. Total polarized intensity is shown as grayscale image. No vectors were drawn for pixels with a SNR  <4 in the total polarized intensity image. Contour levels are drawn at  [1,4,16,64,...]  × 0.18 mJy beam^-1. and are from the Stokes I image.