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\begin{document}
\begin{tabular}{lcccc}
\hline
Yield & \multicolumn{2}{c}{ $ B\xspace\xspace^0$ \xspace} & \multicolumn{2}{c}{ $ B\xspace\xspace^0_ s\xspace\xspace$ \xspace} \\
      & \phantom{eee}long\phantom{eee} & downstream       & \phantom{eee}long\phantom{eee} & downstream       \\
\hline
$N( K\xspace\xspace^{*\pm}\xspace K\xspace\xspace^\mp\xspace)$  & $0 \pm 4$ & $\phantom{1}4 \pm 3$ & $40 \pm 8$ & $62 \pm 10$ \\
$N( K\xspace\xspace^{*\pm}\xspace\pi\xspace\xspace^\mp\xspace)$ & $80 \pm 10$ & $165 \pm 16$ & $\phantom{1}5 \pm 4$ & $23 \pm 8\phantom{1}$ \\
$N( K\xspace\xspace^0_{\rm\scriptscriptstyle S}\xspace\pi\xspace\xspace^\pm\xspace K\xspace\xspace^\mp\xspace \ \text{NR})/N( K\xspace\xspace^{*\pm}\xspace K\xspace\xspace^\mp\xspace)$  & \multicolumn{2}{c}{$0.0\pm 1.0$}   & \multicolumn{2}{c}{$0.41 \pm 0.16$} \\
$N( K\xspace\xspace^0_{\rm\scriptscriptstyle S}\xspace\pi\xspace\xspace^\pm\xspace\pi\xspace\xspace^\mp\xspace \ \text{NR})/N( K\xspace\xspace^{*\pm}\xspace\pi\xspace\xspace^\mp\xspace)$ & \multicolumn{2}{c}{$0.79\pm 0.14$} & \multicolumn{2}{c}{$0.6 \pm 0.4$} \\
\hline
\end{tabular}
\end{document}
