Figure 1 in the above publication (Xiao et al. 2013) contained an error. The correct Figure 1 is given below.
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20180418064415285-0510:S001675681300085X:S001675681300085X_fig1g.gif?pub-status=live)
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Published online by Cambridge University Press: 18 October 2013