Nature Communications 7: Article number: 13040 (2016); Published: 10 October 2016; Updated: 30 August 2017

This Article contains typographical errors in Fig. 3 and Equation 23.

In Fig. 3c, the labels ‘12C’ and ‘13C’ in the key should be reversed. The correct version of Fig. 3 appears below as Fig. 1.

Figure 1
figure 1

The correct form of Equation 23 is as follows: