Correction to: Nature Geoscience https://doi.org/10.1038/s41561-017-0033-0, published online 8 January 2018.

In the version of this Article originally published, the word ‘from’ was incorrectly spelt as ‘form’ in Fig. 4b–d. In addition, the coloured scale bar was incorrectly labelled with a range of –1.5 to –1.5; this should have been –1.5 to +1.5. These errors have now been corrected in the online versions.