Maps of Faraday rotation measure (color, in rad m^-2) of the Sausage relic (left) and the Toothbrush relic (right), computed for regions where the polarized intensity exceeds ten times the rms noise σ_QU in U and Q at both frequencies. The contours show the polarized intensity at 8.35 GHz at [1, 2, 3, 4, 6]  × 0.3 mJy/beam for the Sausage relic (left) and at [1, 2, 3, 4, 6, 8, 10]  × 0.5 mJy/beam for the Toothbrush relic (right). The beam sizes are 159″ × 159″. The RM of + 532 ± 39 rad m^-2 of source D south of the Sausage relic is beyond the color range and is not shown in the left figure.