pair_coul_dsf.tex
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pair_coul_dsf.tex
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			\documentclass[12pt]{article}

			\begin{document}
			$$
			E =
			q_iq_j \left[ \frac{\mbox{erfc} (\alpha r)}{r} - \frac{\mbox{erfc} (\alpha r_c)}{r_c} +
			\left( \frac{\mbox{erfc} (\alpha r_c)}{r_c^2} + \frac{2\alpha}{\sqrt{\pi}}\frac{\exp (-\alpha^2 r^2_c)}{r_c} \right)(r-r_c) \right] \qquad r < r_c
			$$

			\end{document}