Correction to: Nature Communications https://doi.org/10.1038/s41467-018-03696-w; published online 10 April 2018

The original version of this Article contained an error in Equation (1), which incorrectly read “\({\mathrm{Absorbance}} = \log \left( {\frac{{I_0}}{I}} \right) = \varepsilon lh\)”.

The correct version reads “\({\mathrm{Absorbance}} = \log \left( {\frac{{I_0}}{I}} \right) = \varepsilon lc\)”. This has been corrected in both the PDF and HTML versions of the Article.