small edits

Author: hmayes

paper/basic_training.bib

@@ -991,6 +991,7 @@ @article{Ewald_1921
 journal = {Annalen der Physik},
 volume = {369},
 number = {3},
+year = {1921},
 pages = {253-287},
 doi = {10.1002/andp.19213690304},
 url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/andp.19213690304},

paper/basic_training.tex

@@ -1061,7 +1061,7 @@ \subsubsection{ Ewald Summation}
 \label{charges_ewald}
 \end{figure}
 
-Unlike the original, full potential, the direct space screened interaction (Figure~\ref{fig:screening}, top) decays rapidly (Figure~\ref{fig:charges_ewald}).
+Unlike the original, full potential, the direct space screened interaction (Figure~\ref{fig:screening}, top) decays rapidly (Figure~\ref{charges_ewald}).
 In fact, it decays even faster than Van der Waals interactions ($1/r^{6}$) and hence relative short cutoffs, comparable to those used for Van der Waals interactions, can be used for handling direct-space Coulomb interactions.