tokens: Acknowledgments We thank the anonymous referee for a helpful report that allowed us to improve the manuscript. We thank Arwa Dabbech, Chiara Ferrari, Ivan Marti-Vidal, Stephen Wilkins and Ilana Feain for useful discussions. DM acknowledges support from the Science and Technology Facilities Council (grant number ST/M503836/1). MTS acknowledges support from a Royal Society Leverhulme Trust Senior Research Fellowship. PPP is supported by an Ernest Rutherford Fellowship. JS was supported in part by ERC Project No. 267117 (DARK) hosted by Universit Pierre et Marie Curie (UPMC) Paris 6. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research made use of aplpy , an open-source plotting package for python hosted at http://aplpy.github.com . This research made use of astropy , a community-developed core python package for Astronomy (Astropy Collaboration 2013 ).
ner_tags: O O O O O O O O O O O O O O O O O O O B-Person I-Person B-Person I-Person B-Person I-Person B-Person I-Person O B-Person I-Person O O O B-Person O O O O B-Organization I-Organization I-Organization I-Organization I-Organization B-Grant I-Grant I-Grant B-Person O O O O B-Organization I-Organization I-Organization I-Organization B-Fellowship I-Fellowship I-Fellowship B-Person O O O O B-Fellowship I-Fellowship I-Fellowship B-Person O O O O O B-Organization B-Grant I-Grant I-Grant B-Grant O O B-Organization I-Organization I-Organization I-Organization I-Organization B-Organization B-Location O O B-Observatory I-Observatory I-Observatory I-Observatory O O O O O B-Organization I-Organization I-Organization O O O O O B-Organization I-Organization I-Organization O O O O O B-Software O O O O O O B-Software O O B-URL O O O O O O B-Software O O O O B-Software O O O B-Citation I-Citation I-Citation O