Correction to: Nature Physics https://doi.org/10.1038/s41567-018-0089-9, published online 2 April 2018; corrected online 19 April 2018.

In the first correction to this Article, the authors added James P. Butler and Jeffrey J. Fredburg as equally contributing authors. However, this was in error; the statement should have remained indicating that Lior Atia, Dapeng Bi and Yasha Sharma contributed equally. This has now been corrected.