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\begin{document}
  
  
  
  \begin{tabular}{lcc}
    & \multicolumn{2}{c}{Uncertainty (\%)} \\
    Source & \phantom{$<$} $ B\xspace\xspace^0\xspace$ & $ B\xspace\xspace^0_ s\xspace\xspace\xspace$ \\ 
    \hline
    Modelling of efficiency & \phantom{$<$} 3.4 & 3.1\\
    Fit model & \phantom{$<$} 6.3 & 4.3\\
    $ D\xspace\xspace^{*\pm}\xspace$ veto & $<$ 0.1 & 1.0\\
    $ D\xspace\xspace^\pm\xspace$ veto & \phantom{$<$} 2.0 & 0.2\\
    $ D\xspace\xspace^{\pm}_ s\xspace\xspace\xspace$ veto & \phantom{$<$} 0.2 & 0.5\\
    Trigger & \phantom{$<$} 1.0 & 1.0\\
    Particle identification & \phantom{$<$} 1.0 & 1.0\\
    Simulation statistics & \phantom{$<$} 2.0 & 2.0\\
    $f_s/f_d$ & \phantom{$<$} -- & 7.8 \\
    \hline
    Total & \phantom{$<$} 7.8 & 9.8\\
  \end{tabular}
\end{document}
