http://dx.doi.org/10.1017/gov.2017.30, Published online by Cambridge University Press 1 August 2016.
Cambridge University Press are sorry and would like to apologize for the omission of the first label to the x-axis of Figure 1 in this article. This error was made by our typesetter when the article proof was corrected by them.
The mistake was due to human error and oversight in the checking procedure that should never have happened.
Cambridge University Press have taken all the necessary measures to ensure that this won’t happen again.
The correct Figure 1 is reproduced below.