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\begin{centering}  \textbf{Figure 4} 5}  \end{centering}  \par Spacings $\Delta E$ between the minima in the Franck-Hertz curve measured with a Neon tube plotted against minimum order $n$. It appears from the data as if the mean free path is small enough to be insignificant, since the slope of the linear fit is very slight. The short mean free path limit may therefore be used in the subsequent analysis.