deletions | additions       diff --git a/figures/plot_force/caption.tex b/figures/plot_force/caption.tex  index 7899026..afc8264 100644  --- a/figures/plot_force/caption.tex  +++ b/figures/plot_force/caption.tex 
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\label{fig:force_on_neighbor_x_dxn} (color online). Proton in Copper: Force (x-direction) exerted on host atom as a function of parallel distance to projectile at different projectile velocities $v$ along the [100] channeling trajectory.   Oscillations in the force persist for velocities above $1.0 a.u.$, ~\mathrm{a.u.}$,  an interpretation in terms of plasmon excitations is given in \cite{Correa_2012}.