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\label{fig:stopping_power} (color online). The stopping power ($S_\text{e}$) vs. projectile velocity $v$: for a channeling trajectory (red lines) and for off-channeling trajectory (blue crosses). The black continuous lines refers to the nominal tabulated results from the \text{Srim} database for electronic stopping power \cite{Ziegler_2010}. The gray dots refers to the \textsc{Srim} experimental database contained therein \cite{Copper_Stop}.(Lowest velocity experimental point is at $v = \sim 0.2~\mathrm{a.u.}$).  The error bars of the off-channeling trajectory is shown by the blue lines.  (Error bars in channeling trajectories is smaller than the points.)  Open circles and open squares shows data of Cantero \emph{et al.} \cite{Cantero_2009} and Markin \emph{et al.} \cite{Markin_2009} respectively.