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Write a Python function to evaluate the real-space terms before doing the summation over particle pairs but make sure to sum over lattice cells as follows
\begin{align}
c_{ij} = \sum_{\mathbf{n}} \frac{\textrm{erfc} \left( \alpha |\mathbf{r}_{ij} + \mathbf{n} L| \right)}{|\mathbf{r}_{ij} + \mathbf{n} L|}
\end{align}
Inputs are distance vectors `distances` of shape `(natoms, npairs, 1, 3)`, `lattice_coords` of shape `(natoms, 1, ncells, 3)`, and alpha.Discussion
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