doi:http://dx.doi.org/10.1017/psrm.2013.1, Published by Cambridge University Press 2013.
The authors would like to correct a mistake in the expression below.
The mistake is in expression 1. This reads
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160312001223645-0054:S2049847013000265_eqnU1.gif?pub-status=live)
Whereas it should have read
![](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160312001223645-0054:S2049847013000265_eqnU2.gif?pub-status=live)
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Published online by Cambridge University Press: 08 November 2013
doi:http://dx.doi.org/10.1017/psrm.2013.1, Published by Cambridge University Press 2013.
The authors would like to correct a mistake in the expression below.
The mistake is in expression 1. This reads
Whereas it should have read