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tokens: ACKNOWLEDGEMENTS We thank N. Kylafis for useful comments and discussions. We also thank the anonymous referee for useful comments that helped improved this paper. The software used in this work was in part developed by the DOE NNSA-ASC OASCR Flash Center at the University of Chicago. For post-processing our results we partly used yt analysis toolkit (Turk et al. 2011 ). KT and AT acknowledge support by FP7 through Marie Curie Career Integration Grant PCIG-GA-2011-293531 ‘SFOnset’. AT and KT would like to acknowledge partial support from the EU FP7 Grant a39353*PIRSES-GA-2012-31578 ‘EuroCal’. Usage of the Metropolis HPC Facility at the Crete Center for Quantum Complexity and Nanotechnology of the University of Crete, supported by the European Union Seventh Framework Programme (FP7-REGPOT-2012-2013-1) under grant agreement no. 316165, is alsoacknowledged.