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Published online by Cambridge University Press: 10 November 2014
A misprint occured in equation 26 in the original article (Ur-Rahman et al. 2013). The correct equation is provided below. This misprint does not affect the calculations, the figures and the discussion presented in the original article. \[\zeta=\epsilon^{1/2}\left(x-\lambda t\right)\rm{, \\ }\tau=\epsilon^{3/2}t\rm{.}%\]