In the original publication of Webster, Chen, and Beardsley (Reference Webster, Chong and Kyle2019), an error occurred in Figure 6b. The correct Figure 6b is reproduced below:
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20231229152855071-0854:S0020818320000673:S0020818320000673_fig1.png?pub-status=live)
Published online by Cambridge University Press: 22 December 2020
In the original publication of Webster, Chen, and Beardsley (Reference Webster, Chong and Kyle2019), an error occurred in Figure 6b. The correct Figure 6b is reproduced below: