Correction to: Nature Communications https://doi.org/10.1038/s41467-019-08625-z, published online 08 February 2019

The original version of this Article contained an error in Fig. 2c, in which the numbers on the y-axis were given in the wrong order: ‘800’ at the bottom through to ‘0’ at the top. This has been corrected in both the PDF and HTML versions of the Article.

Also, the Source Data file initially published online was corrupted and was replaced.