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tokens: Acknowledgments We thank Volker Springel for allowing the use of his code pgadget3 and the anonymous referee for their suggestions that improved the presentation of our results. We acknowledge support by the Deutsche Forschungsgemeinschaft through the SFB 956, The Conditions and Impact of Star Formation and the TRR 33 The Dark Universe. MB thanks the Bonn-Cologne Graduate School for Physics and Astronomy for support. The authors acknowledge that the results of this research have been achieved using the PRACE-3IP project (FP7 RI-312763), using the computing resources (Cartesius) at SURF/SARA, the Netherlands.