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pair_colloid_ss.tex
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			\begin{eqnarray}
			U &=& \frac{A}{36} \left[ \left( \frac{\sigma}{r} \right)^{12} - \left( \frac{ \sigma}{r} \right)^6 \right], ~~ r < r_c \nonumber
			\end{eqnarray}

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