The authors apologise for the error in the Equation 1b, on page 5 of their paper.
The Equation should read as follows:
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160920222207380-0004:S0007485310000647:S0007485310000647_eqnU1.gif?pub-status=live)
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Published online by Cambridge University Press: 25 November 2010
The authors apologise for the error in the Equation 1b, on page 5 of their paper.
The Equation should read as follows: