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\begin{document}
  
  
  
  \begin{tabular}{l  cc}
    \toprule
    Sources & $\tau_\POmega\xspace^0_ c\xspace\xspace\xspace$ [fs] & $\tau_\Xi\xspace^0_ c\xspace\xspace\xspace$ [fs] \\
    \midrule
    Fit model                     & \phantom{0}2.2  & 1.0 \\
    Calibration sample size       & \phantom{0}0.1  & 0.1 \\
    Kinematic correction          & \phantom{0}3.4  & 0.4 \\
    Decay-time resolution         & \phantom{0}1.3  & 1.8 \\
     $\chi^2_{\text{IP}}$ \xspace scaling              & \phantom{0}1.1  & 0.5 \\
    Decay-length scale            & \phantom{0}0.1  & 0.1 \\
     $ D\xspace\xspace^0$ \xspace-- $\kern 0.18em\overline{\kern -0.18em  D\xspace}\xspace{}^0$ \xspace mixing              & \phantom{0}0.8  & 0.6 \\
    \midrule
    Total systematic uncertainty  & \phantom{0}4.4  & 2.2 \\
    \midrule
     $ D\xspace\xspace^0$ \xspace lifetime                  & \phantom{0}0.7  & 0.2 \\
    \midrule
    Statistical uncertainty       & 13.4 & 2.3 \\
    \bottomrule
  \end{tabular}
\end{document}
