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Authors
Åström, J. A.
Vallot, D.
Schäfer, M.
Welty, E. Z.
O’Neel, S.
Bartholomaus, T. C.
Liu, Yan
Riikilä, T. I.
Zwinger, T.
Timonen, J.
Moore, J. C.
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Article History
Received: 4 June 2014
Accepted: 9 October 2014
First Online: 10 November 2014
Change Date: 18 November 2014
Change Type: Corrigendum
Change Details: In the version of this Letter originally published online, the following sentence should have appeared in the Acknowledgements section: "The simulated graphics have been rendered by J. Hokkanen (CSC-IT Centre for Science)". This error has been corrected in all versions of the Letter.
Competing interests
: The authors declare no competing financial interests.
