The authors apologise for the error in the Equation 1b, on page 5 of their paper.
The Equation should read as follows:
![$${R^{2}}_{n} = nL_{2}+({2L_{1}} ^{2}}) (c / (1 - c)) (n - (1 - c^n )/(1 - c ))$$](https://static.cambridge.org/binary/version/id/urn:cambridge.org:id:binary:20160920222207380-0004:S0007485310000647:S0007485310000647_eqnU1.gif?pub-status=live)
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: