a) GMRT full-resolution image at 327 MHz (contours and colors). The restoring beam is 14′′ × 12′′. Black contours start at +3σ = 0.36 mJy beam^-1 and then scale by a factor of 2. The  − 3σ level is shown as red, dashed contours. b) GMRT 327 MHz contours, after subtraction of S2 and S3 (panel a), overlaid on the smoothed RASS X-ray image. The restoring beam is 53′′ × 41′′ and the rms noise level is 0.27 mJy beam^-1. Contours start at +3σ and then scale by a factor of 2. The  − 3σ level is shown as black dashed contours. The cross shows the position of the cluster X-ray centre.