Map of the maximum polarised intensity in each pixel obtained with the RM synthesis technique, with overlaid radio contours from 3σ_I and scaling by a factor of 2. The Galactic bubble polarised emission can be seen in the top-left side of the image. Dashed circle corresponds to the reference distance of 1 Mpc from the cluster centre. Solid red line represent the 0.23° (∼1381 kpc) separation threshold for MeerKAT off-axis leakage in the L-band above 1.4 GHz. Spatial scales and resolution beam are reported on the edges of the map.