Correction to: Nature Physics https://doi.org/10.1038/s41567-018-0166-0, published online 4 June 2018.
In the version of this Measure for Measure originally published, the discrepancy in the fifth paragraph was incorrectly written as 7σ; it should have been 5.6σ. This has now been corrected.
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Udem, T. Author Correction: Quantum electrodynamics and the proton size. Nature Phys 14, 767 (2018). https://doi.org/10.1038/s41567-018-0211-z