Correction to: Nature Physics https://doi.org/10.1038/s41567-018-0105-0, published online 16 April 2018.
In the version of this Letter originally published, the units of the bottom three values in the Fig. 1d legend were incorrect; they should have been W cm–2. This has now been corrected.
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Matthews, M., Morales, F., Patas, A. et al. Publisher Correction: Amplification of intense light fields by nearly free electrons. Nature Phys 14, 767 (2018). https://doi.org/10.1038/s41567-018-0208-7
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DOI: https://doi.org/10.1038/s41567-018-0208-7