tSZ Planck map of the A3558-A3562 clusters system as well as the two massive groups of galaxies SC 1327 and SC1329. The triangles represent the locations of the background ASKAP radiogalaxies and they are colored according to their |RRM| values. We also show the r₅₀₀ of the four objects as reference for the size of the system at the plane of the sky, along with their centers. The black contour represents the threshold we used to define the boundary between the off-target and on-target regions: y_bdry = 2y_rms = 4.24 × 10⁻⁶. The rectangular box defines the bridge. The sources inside it sample the region between the Abell clusters and outside their r₅₀₀, despite some overlapping effects. The counterpart on-target sources that lie outside the box mainly sample the inside the of r₅₀₀ of the clusters, thus its name: the clusters subsample.