deletions | additions       diff --git a/Fig_ref_fig_stopping_power_shows__.tex b/Fig_ref_fig_stopping_power_shows__.tex  index 0a97c9f..907d7de 100644  --- a/Fig_ref_fig_stopping_power_shows__.tex  +++ b/Fig_ref_fig_stopping_power_shows__.tex 
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At higher velocities ($v > 4 ~\mathrm{a.u.}$) further disagreement stems from combined effect of the lack of explicit core electrons in the simulation and also size effects, as excitations of long wavelength plasma oscillation is constrained by the simulation supercell \cite{Schleife_2015}.   It is clear that a larger cell and eventually the inclusion of more core electrons would be necessary to obtain better agreement in this region.  The existence of plasma oscillations is detected in our simulations by persistent charge motion above a certain threshold velocity of $v \simeq 1~\mathrm{a.u.}$. 1.0~\mathrm{a.u.}$.  This plasma oscillations have a dramatic effects in the components forces over individual $\mathrm{Cu}$ atoms near the track of the passing hydrogen (Fig.~\ref{fig:force_on_neighbor}).   This forces persist (and oscillate) even after the proton has passed.