Fig. 2.

γ-ray field around the very rich cluster 12Y-MST J1512-0906 (red circles), showing the clusters found by MST after the primary selection. Other coloured circles are the clusters in this region (also indicated by a letter), black crosses are the positions in the 12Y catalogue, large black squares are 4FGL sources, and green crosses correspond to the position of blazar-like objects. Clusters D, E, and F are rejected in the secondary selection.
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