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\begin{document}
 
\begin{minipage}[t]{0.99\textwidth}
  
  \begin{tabular}{|l|l|l|}
    \hline
    Source of uncertainty               & Uncertainty on            & Uncertainty on        \\ 
                                        &  $\tau_{KK }$ \xspace (fs)           &  $\tau_{KK }\xspace^{-1} ~ - ~ \tau_{K\pi}\xspace^{-1}$  (ns$^{-1}$) \\ \hline \hline
    Fit method                          & 3.2                       &   \\ 
    Acceptance correction               & 6.3                       &  $\quad$ 0.5 \\
    Mass model                          & 1.9                       &   \\
     $ B\xspace\xspace\!\rightarrow\xspace  h\xspace^+  h\xspace'^-$ \xspace background                   & 1.9                       & 1.4    \\
    Partially reconstructed background  & 1.9                       & 1.1   \\
    Combinatorial background            & 1.5                       & 1.6   \\
    Primary vertex association          & 1.2                       & 0.5  \\   
    Detector length scale               & 1.5                       & 0.7    \\
    Production asymmetry                & 1.4                       & 0.6 \\
    Minimum accepted lifetime           & 1.1                       & N/A \\ \hline \hline
    Total (added in quadrature)         & 8.4                       & 2.7 \\ \hline
    Effective lifetime interpretation   & 2.8                       & 1.1 \\ \hline
    \end{tabular}
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