deletions | additions       diff --git a/At_low_velocity_our_results__.tex b/At_low_velocity_our_results__.tex  index 57b56ca..b2cb760 100644  --- a/At_low_velocity_our_results__.tex  +++ b/At_low_velocity_our_results__.tex 
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Below $0.02~\mathrm{a.u.}$, the lack of experimental points precludes a direct comparison, but we find a large deviation from linear behavior.   One possible explanation is that bound effects break down the linear response (Linhard) approximation that was useful to interpret the different regimes and crossover at $v > 0.02~\mathrm{a.u.}$.   Probing this regime experimentally would be difficult, specially especially  to disentangle it from nuclear stopping effects, but if  this is confirmed that would be an unexpected new result. regime possibly related to quantum bound effects.  In any case, the combination of experimental and theoretical result shows that the limit $v\to 0$ is intricate for metals as it is for insulators \cite{Artacho_2007, Lim_2015}. %