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In the article by Rolt(1), there was an error in Equation (2). The correct equation is republished here.2 
$$\begin{equation}{W_c} = \ \frac{{{W_{\it cref}}\left( {{T_{\it grel}} - {T_{\it cref}}} \right){{({W_4}/{W_{\it 4ref}})}^{0.65}}}}{{\left( {{T_{\it gref}} - {T_c}} \right)}}\ \ \ \ \ \ \\end{equation}$$
