Vedantham, H. K. http://orcid.org/0000-0002-0872-181X
Callingham, J. R. http://orcid.org/0000-0002-7167-1819
Shimwell, T. W. http://orcid.org/0000-0001-5648-9069
Tasse, C.
Pope, B. J. S. http://orcid.org/0000-0003-2595-9114
Bedell, M.
Snellen, I.
Best, P.
Hardcastle, M. J. http://orcid.org/0000-0003-4223-1117
Haverkorn, M.
Mechev, A.
O’Sullivan, S. P. http://orcid.org/0000-0002-3968-3051
Röttgering, H. J. A. http://orcid.org/0000-0001-8887-2257
White, G. J.
Article History
Received: 22 February 2019
Accepted: 6 January 2020
First Online: 17 February 2020
Change Date: 24 February 2020
Change Type: Update
Change Details: In the PDF version of this Letter originally published, the text in the penultimate paragraph of the main text, ‘with semi-amplitude of 4.3 × 10<sup>13</sup> ergs s<sup>–1</sup> Hz<sup>–1</sup>’, was incorrect; it should have read ‘with semi-amplitude of ~1 m s<sup>–1</sup> × sin<i>i</i>’. This has now been updated.
Competing interests
: The authors declare no competing interests.