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tokens: ACKNOWLEDGEMENTS We thank the referee, Prof. Harald Ebeling, for his insightful comments that allowed us to strengthen the results presented in this paper. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme 196.B-0578. We acknowledge funding from the INAF PRIN-SKA 2017 program 1.05.01.88.04 (PI Hunt). YJ acknowledges support from CONICYT PAI (Concurso Nacional de Inserción en la Academia 2017) No. 79170132.