Nature 543, 728–732 (2017); doi:10.1038/nature21676

In this Letter, owing to an error during the production process, the x-axis label ‘BEZ + ICB’ appeared twice in each of the graphs in Fig. 1d–f, and the ‘Cabo + ICB’ label was missing. In each graph, the first ‘BEZ + ICB’ label should have read ‘Cabo + ICB’. The original Letter has been corrected online.