tokens: The authors would like to thank Stefan Hilbert, Sherry Suyu, Malte Tewes, James Nightingale and an anonymous referee for very useful comments. DDX thanks the HITS fellowship. DS acknowledges support from a Back to Belgium grant from the Belgian Federal Science Policy (BELSPO) and partial funding from the Deutsche Forschungsgemeinschaft, reference SL172/1-1. PS and VS acknowledge support by the DFG through Transregio 33, ‘The Dark Universe’. VS also acknowledges support by the European Research Council under ERC-StG EXAGAL-308037. LH acknowledges support from NASA grant NNX12AC67G and NSF grant AST-1312095. DDX and VS gratefully acknowledge the support of the Klaus Tschira Foundation.
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