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\begin{document}
  
  
             
           
  
  
{2011}
  
    \begin{tabular}{l | >{\hfill} p{0.9cm}@{$\,\pm\,$}p{0.5cm}  >{\hfill} p{1.25cm}@{$\,\pm\,$}p{1.25cm} | >{\hfill} p{0.9cm}@{$\,\pm\,$}p{0.5cm}  >{\hfill} p{1.25cm}@{$\,\pm\,$}p{1.25cm} }
            & \multicolumn{4}{c|}{downstream}                                         & \multicolumn{4}{c}{long}                                         \\
      Decay       & \multicolumn{2}{c}{Yield} & \multicolumn{2}{c|}{Efficiency (\%)} & \multicolumn{2}{c}{Yield} & \multicolumn{2}{c}{Efficiency (\%)} \\
      \hline
       $ B\xspace\xspace^0\xspace\!\rightarrow\xspace  K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}\xspace \pi\xspace\xspace^+\xspace \pi\xspace\xspace^-\xspace$ \xspace & $803$ & $36$              & $0.0488$ & $0.0093$                  & $471$ & $27$              & $0.0188$ & $0.0036$                 \\
       $ B\xspace\xspace^0\xspace\!\rightarrow\xspace  K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}\xspace  K\xspace\xspace^+\xspace  K\xspace\xspace^-\xspace$ \xspace   & $281$ & $19$              & $0.0292$ & $0.0063$                  & $222$ & $17$              & $0.0157$ & $0.0034$                 \\
       $ B\xspace\xspace^0_ s\xspace\xspace\xspace\!\rightarrow\xspace  K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}\xspace  K\xspace\xspace^\pm\xspace \pi\xspace\xspace^\mp\xspace$ \xspace  & $333$ & $23$              & $0.0361$ & $0.0064$                  & $207$ & $16$              & $0.0148$ & $0.0025$                 \\
       $ B\xspace\xspace^0\xspace\!\rightarrow\xspace  K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}\xspace  K\xspace\xspace^\pm\xspace \pi\xspace\xspace^\mp\xspace$ \xspace  &  $76$  & $13$              & $0.0322$ & $0.0063$                  & $50$  & $9$                 & $0.0174$ & $0.0034$                 \\
       $ B\xspace\xspace^0_ s\xspace\xspace\xspace\!\rightarrow\xspace  K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}\xspace \pi\xspace\xspace^+\xspace \pi\xspace\xspace^-\xspace$ \xspace &  $43$  & $10$              & $0.0316$ & $0.0051$                  & $21$  & $8$                 & $0.0160$ & $0.0025$                 \\
       $ B\xspace\xspace^0_ s\xspace\xspace\xspace\!\rightarrow\xspace  K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}\xspace  K\xspace\xspace^+\xspace  K\xspace\xspace^-\xspace$ \xspace   &  $5$   & $3$                 & $0.0244$ & $0.0052$                  & $4$   & $3$                   & $0.0129$ & $0.0029$                 \\
    \end{tabular}
  
\end{document}
