More caption cleanup

Author: davidlmobley

paper/basic_training.tex

@@ -1063,13 +1063,13 @@ \subsubsection{ Ewald Summation}
 \end{figure}
 
 Unlike the original, full potential, the direct space screened interaction (Figure~\ref{fig:screening}, top) decays rapidly (Figure~\ref{fig: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.
+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.
 
 
 \begin{figure}[h]
 \centering
 \includegraphics[width=\linewidth]{decay_comparison.pdf}
-    \caption{Comparison of decay of original $r^{-1}$ term(blue,*), erfc(r) in direct space(black,-) and $r^{-6}$ in van der waals term (red, -.).  }
+    \caption{Comparison of decay of the original $r^{-1}$ term for Coulomb interactions (blue,*), the resulting direct-space term after Gaussian screening (black,-) and the $r^{-6}$ in van der Waals term (red, -.).  }
 \label{decay}
 \end{figure}