Faraday rotation measure RM (colour) between λ11.3 cm and λ6.2 cm at 5′ HPBW, calculated at pixels where PI at both frequencies exceeds three times the rms noise. The error decreases from 26 rad m⁻² at the lowest signal-to-noise ratio (S/N = 3) to about 3 rad m⁻² at the highest S/N. Contours show the polarized intensity at λ11.3 cm at the same resolution. Contour levels are at 1, 2, and 4 mJy beam⁻¹. Polarized background sources have been subtracted. The HPBW is indicated in the bottom left corner. The coordinate system is rotated by −53°.