Correction to: Nature Communications https://doi.org/10.1038/s41467-018-05874-2, published online 17 August 2018.

The original version of this Article contained an error in Fig. 1g in which a top x-axis was shown with incorrect labels for the wavelength. The correct version of Fig. 1g, which removes this labelling, is:

which replaces the previous incorrect version:

This has been corrected in both the PDF and HTML versions of the Article.