Correction to: Nature https://doi.org/10.1038/s41586-020-2908-2 Published online 18 November 2020

In Fig. 2b of the print version of this Article, owing to a production error, the horizontal axis was labelled 5, 10, 1, 520 and 25 rather than 5, 10, 15, 20 and 25. The online versions (HTML, PDF) are correct so the Article has not been corrected online.