ner_tags: O O B-Telescope I-Telescope I-Telescope I-Telescope O O O O B-Organization I-Organization I-Organization I-Organization I-Organization B-Organization O O O O B-Organization I-Organization I-Organization I-Organization I-Organization B-Organization B-Person O B-Person O O O O B-Organization I-Organization I-Organization B-Organization O O B-Location I-Location B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant O O O B-Grant O O O O O B-Person I-Person B-Person I-Person I-Person O B-Person I-Person O O O O O B-Person O O O O O B-Fellowship I-Fellowship I-Fellowship I-Fellowship O O O O O O O O O O O O O O O O O O O O O
tokens: ACKNOWLEDGEMENTS The Westerbork Synthesis Radio Telescope is operated by the Netherlands Institute for Radio Astronomy (ASTRON) with support from The Netherlands Foundation for Scientific Research (NWO). LND and BWS acknowledge support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 694745). We would like to thank Andrew Lyne, Marten van Kerkwijk, and James McKee for useful and interesting discussions. LND would like to thank the ASTRON/JIVE summer studentship programme for a fellowship in 2014. We thank the referee, assistant editor, and scientific editor for their constructive comments on the manuscript.