\documentclass{article}
\begin{document}
\begin{table}
\small
\centering
\begin{tabular}{c|cc}
Source & Variation up (Stat. up) \% & Variation down (Stat. down) \% \\ \hline 
muR\_muF-Diboson\_SR1LBin0\_Incl & 15.874 & -19.3325 \\ 
muR\_muF-Diboson\_SR1LBin1\_Incl & 15.6814 & -18.7542 \\ 
muR\_muF-Diboson\_SR1LBin2\_Incl & 15.5708 & -18.9087 \\ 
muR\_muF-Diboson\_SR1LBin3\_Incl & 15.8418 & -18.7831 \\ 
muR\_muF-Diboson\_SR1LBin4\_Incl & 15.686 & -19.9343 \\ 
muR\_muF-Diboson\_tW1L\_CRtt & 19.2405 & -22.2455 \\ 
muR\_muF-Diboson\_tW1L\_CRWp & 10.3588 & -12.7182 \\ 
muR\_muF-Diboson\_tW1L\_CRWm & 11.9293 & -16.0311 \\ 
muR\_muF-Diboson\_tW1L\_VRtt\_VR1 & 15.6185 & -19.2541 \\ 
muR\_muF-Diboson\_tW1L\_VRtt\_VR2 & 15.7622 & -19.7516 \\ 
muR\_muF-Diboson\_tW1L\_VRW\_VR1p & 11.362 & -14.8609 \\ 
muR\_muF-Diboson\_tW1L\_VRW\_VR1m & 10.9762 & -11.4854 \\ 
muR\_muF-Diboson\_tW1L\_VRW\_VR2p & 15.3459 & -19.0691 \\ 
muR\_muF-Diboson\_tW1L\_VRW\_VR2m & 15.7512 & -19.9776 \\ 
\end{tabular}
\end{table}
\end{document}
