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Authors
Millholland, Sarah https://orcid.org/0000-0003-3130-2282
Laughlin, Gregory
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Article History
Received: 15 June 2018
Accepted: 16 January 2019
First Online: 4 March 2019
Change Date: 24 April 2019
Change Type: Update
Change Details: In the version of this Letter originally published, the following ‘Journal peer review information’ was missing: “<i>Nature Astronomy</i> thanks Jianghui Ji and the other anonymous reviewer(s) for their contribution to the peer review of this work.” This statement has now been added.
Competing interests
: The authors declare no competing interests.
