deletions | additions       diff --git a/At_low_velocity_our_results__.tex b/At_low_velocity_our_results__.tex  index b2cb760..1b59312 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, especially to disentangle it from nuclear stopping effects, but if this is confirmed that it  would be an unexpected new regime possibly related toquantum  bound effects. In any case, the combination of experimental and theoretical result shows results show  that the limit $v\to 0$ is intricate for metals as it is for insulators \cite{Artacho_2007, Lim_2015}. %