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\begin{document}
 


\begin{tabular}{lr@{$\,\pm\,$}lr@{$\,\pm\,$}l} 
\hline 
Parameter & \multicolumn{2}{c}{Run~1} &  \multicolumn{2}{c}{Run~2} \\
\hline
 $\Xi\xspace^-_ b\xspace\xspace\xspace\!\rightarrow\xspace  p\xspace\xspace  K\xspace\xspace^-\xspace  K\xspace\xspace^-\xspace$ \xspace\ yield  		& 193 & 21	& 297 & 23 	\\
 $\POmega\xspace^-_ b\xspace\xspace\xspace\!\rightarrow\xspace  p\xspace\xspace  K\xspace\xspace^-\xspace  K\xspace\xspace^-\xspace$ \xspace\ yield 		& $-4$ & 6 	&  15 &  9 	\\
Partially reconstructed background yield & 231 & 34 	& 442 & 36 	\\
Combinatorial background yield 		& 721 & 50 	& 775 & 51 	\\
\hline
\end{tabular} 
\end{document}
