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\begin{document}
 
 
 
 
\begin{tabular}{ |l|c| } \hline 
Systematic sources &  Uncertainty on  $\tau_{KK }$ \xspace [fs] \\ \hline 
Reconstruction efficiency   & $5$ \\
Signal model &   $1$\\ 
Background model &  $1$\\ 
Length scale   & $1$ \\
Minimum decay time requirement & $1$ \\ 
Production asymmetry           & $2$ \\ \hline
Total & $6$   \\ \hline 
\end{tabular} 
 
\end{document}
