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\begin{tabular}{lc|lc}\hline\hline
Source & Error (\%)&Source & Error (\%)\\\hline
Luminosity & 10.0&Prompt \& Dfb shapes & 1.4\\
Tracking efficiency   &  10.0  &    ${\cal{B}}\left(D^0\to K^-\pi^+\right)$ & 1.3 \\
${\cal{B}}(b\to D^0 X\mu^-\overline{\nu})$ & 5.1 &$D^0\mu^-$ vertex $\chi^2$ cut& 1.2\\
Assumed branching fractions & 4.4 &Kaon identification & 1.2\\
LEP fragmentation fractions & 4.2 &Muon fakes & 1.0\\
Generated $b$ $p_{\rm T}$ distribution &3.0&$D^0$ mass cut & 1.0\\
Muon identification & 2.5&$D^0$ vertex $\chi^2$ cut & 0.6\\
$\chi^2_{\rm IP}$  cut& 2.5&$D^0$ flight distance cut & 0.4\\
MC statistics & 1.5  &Pion identification & 0.3\\
\hline
\multicolumn{2}{c}{Total}&\multicolumn{2}{c}{17.3\%}\\
\hline \hline
\end{tabular}

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