Top panel: 3 GHz map (UNIFORM) at a resolution of 7′′.5 × 8′′.5 with rms noise = 40.1 μJy beam-1. Middle panel: 3 GHz map (ROBUST 0) at a resolution of 8′′.7 × 5′′.8, and rms noise = 20.4 μJy beam-1. Bottom panel: 3 GHz map (NATURAL, UVTAPER = [0,20]) at a resolution of 13′′.1 × 8′′.5, and rms noise = 18.5 μJy beam-1. In black there are the polarization vectors. In all panels the white contour levels are –3, 3, 6, 12, 24 × rms noise in all maps, the red ones are the 7, 14 × rms of 1.4 GHz maps made with comparable resolution.The rms levels of the red contours are 21.9 μJy beam-1.
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