Close-up view of a crowded ∼30 × 30 Mpc² region of Fig. 2. Each panel covers ∼8.5 ° ×8.5° in the sky. As in Fig. 12, the left panel gives the photon counts for a 1 Ms integration in the [0.8–1.2] keV band using WFI while the right panel gives the result of a mock radio survey at 260 MHz with the SKA-LOW, in both cases with noise included. The additional yellow rectangles show pairs of clusters with ongoing mergers.