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\begin{document}
\begin{tabular}{cc}
  \hline
  \hline
   Source  & Relative uncertainty in  $\mathcal{B}$  \\
  \hline
   Fit model  & $0.04\phantom{0}$ \\
   $f_0$  & $0.06\phantom{0}$ \\
   Purity  & $0.08\phantom{0}$ \\
   Acceptance  & $0.005$ \\
    $\mathcal{B}$ ( $ B\xspace\xspace^0\xspace \rightarrow\xspace \phi  K\xspace\xspace^{*0}\xspace$ \xspace) & $0.06\phantom{0}$ \\
  \hline
   Total & $0.12\phantom{0}$ \\
  \hline
  \hline
\end{tabular}
\end{document}
