Correction to: Nature Communications 10.1038/s41467-020-18007-5, published online 20 August 2020.
The original version of this Article contained an error in Fig. 4f, in which the units on the vertical axis should be “(nT Hz−1/2)”, as opposed to “(nV Hz−1/2)”.
This has been corrected in both the PDF and HTML versions of the Article.