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tokens: ACKNOWLEDGEMENTS We thank A. El-Zant for his careful reviewing, F. Combes, A. Nusser, F. van den Bosch, O. Ginzburg, T. Nussbaum, Y. Birnboim, and M. Kretschmer for stimulating discussions and physical insights. This work was partly supported by the grants France-Israel International Projects of Scientific Collaboration (PICS), Israeli Centers of for Research Excellence (I-CORE) Program of the Planning and Budgeting Committee(PBC)/Israel Science Foundation (ISF) 1829/12, U.S-Israel Binational Science Foundation (BSF) 2014-273, National Science Foundation (NSF) AST-1405962, German-Israeli Foundation for Scientific Research and Development (GIF) I-1341-303.7/2016, and Deutsch-Israelische Projektkooperation (DIP) STE1869/2-1 GE625/17-1. NIHAO simulations were carried out at the Gauss Centre for Super-computing e.V. (GCS, www.gauss-centre.eu ) at the GCS Supercomputer SuperMUCat Leibniz Supercomputing Centre ( www.lrz.de ) and on the High Performance Computing resources at New York University Abu Dhabi.