Correction to: Nature Physics https://doi.org/10.1038/s41567-020-0930-9, published online 15 June 2020.

In the version of this Article originally published online, in Fig. 3 and its caption, the relation ‘Fc<F<Ff’ was incorrect; it should have been ‘Ff<F<Fc’. Also in Fig. 3, typographical errors led to missing minus signs from the superscripts on both axes; the vertical axis label was ‘F × k2a2E1/3(μp0)4/3’ but should have been ‘F × k2a–2E1/3(μp0)–4/3’, the horizontal axis label was ‘d0/L × k1E1/3(μp0)1/3’ but should have been ‘d0/L × k1E1/3(μp0)–1/3’. All versions of the Article have been amended.