In the Research Highlight 'Metrology: Timing is everything' originally published (Nat. Photon. 11, 141; 2017), in the sentence beginning 'A complete laser-microwave network operated...', '950 seconds' should have read '950 attoseconds'. Corrected in the online versions 14 March 2017.
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The online version of the original article can be found at 10.1038/nphoton.2017.27
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Correction. Nature Photon 11, 214 (2017). https://doi.org/10.1038/nphoton.2017.54
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DOI: https://doi.org/10.1038/nphoton.2017.54
