VLA L-band (left) and S-band (right) polarization intensity maps at 15″ resolution. Red lines represent the magnetic field vectors. Their orientation represents the projected magnetic field corrected for Faraday rotation and the contribution from the Galactic foreground. For all four relics, the magnetic-field vectors are uniformly disturbed and parallel to the orientation of the radio emission. The vector lengths is proportional to the polarization percentage. No vectors were drawn for pixels below 3σ. Contour levels are drawn at [1, 2, 4, 8, …] × 5σ_rms and are from the Stokes I images.