Scientific Data 4:170063 doi: 10.1038/sdata.2017.63 (2017); Published 23 May 2017; Updated 11 July 2017

In Fig. 6 of this Data Descriptor the colour gradient of the scale bar was inadvertently modified during the production process. The correct version of Fig. 6 appears below as Fig. 1.

Figure 1
figure 1