tokens: We thank an anonymous referee for helpful comments that considerably improved the manuscript. GB thanks Judd Bowman, Andrea Ferrara, Adrian Liu and Aaron Ewall-Wice for useful inputs and comments on this work and Jordan Mirocha for help with ares . The LEDA experiment is supported by NSF grants AST/1106059 and PHY/0835713. JZ gratefully acknowledges a South Africa National Research Foundation Square Kilometre Array Research Fellowship. This research was supported by the Munich Institute for Astro- and Particle Physics (MIAPP) of the DFG cluster of excellence ‘Origin and Structure of the Universe’. With the support of the Ministry of Foreign Affairs and International Cooperation, Directorate General for the Country Promotion (Bilateral Grant Agreement ZA14GR02 – Mapping the Universe on the Pathway to SKA).
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