The original version of this article omitted the following from the Acknowledgements:'P.B. was funded by the ELI Extreme Light Infrastructure Phase 2 (CZ.02.1.01/0.0/0.0/15008/0000162) from the European Regional Development Fund and the EUCALL project funded from the EU Horizon 2020 research and innovation programme under grant agreement No 654220,' which replaces the previous 'P.B. was funded by the ELI Extreme Light Infrastructure Phase 2 (CZ.02.1.01/0.0/0.0/15008/0000162) from the European Regional Development Fund.'This has been corrected in both the PDF and HTML versions of the article.

Advanced Light Source Lawrence Berkeley National Laboratory Berkeley CA 94720 USA

Department of Electrical and Computer Engineering University of Alberta Edmonton AB T6G 1H9 Canada

Deutsches Elektronen Synchrotron DESY Notkestraße 85 Hamburg D 22607 Germany

ELI Beamlines Institute of Physics of the Czech Academy of Sciences Na Slovance 2 Prague 18221 Czech Republic

European 10 Ray Free Electron Laser Facility GmbH Schenefeld 22869 Germany

SLAC National Accelerator Laboratory Menlo Park CA 94720 USA

Thayer School of Engineering Dartmouth College 14 Engineering Dr Hanover NH 03755 USA

Nat Commun. 2018 Apr 10;9(1):1353. doi: 10.1038/s41467-018-03696-w. PubMed

References provided by Crossref.org