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\begin{document}
   
  
  
   
  \begin{tabular*}{0.90\textwidth}{@{\hspace{5mm}}l@{\extracolsep{\fill}}ccc@{\hspace{5mm}}}
      Source  
      & $ B\xspace\xspace^0_ s\xspace\xspace\xspace\rightarrow\xspace\psi\xspace\eta\xspace$
      & $ B\xspace\xspace^0\xspace\rightarrow\xspace\psi\xspace\pi\xspace\xspace^+\pi\xspace\xspace^-\xspace$ 
      & $ B\xspace\xspace^0_ s\xspace\xspace\xspace\rightarrow\xspace\psi\xspace\pi\xspace\xspace^+\pi\xspace\xspace^-\xspace$ 
      \\
      \hline
      Fit model 
      &  \phantom{0}8.0     
      &  1.0   
      &  \phantom{0}1.6
      \\
      Mass dependence of efficiencies
      &  --- 
      &  2.0  
      &  \phantom{0}2.0 
      \\
      Efficiencies from simulation 
      &  11.5 
      &   8.0 
      &  \phantom{0}8.0
      \\
      Acceptance 
      &  $\hspace{-2.5mm}<0.5$ 
      &  1.1 
      &  $\hspace{-2.5mm}<0.5$ 
      \\ 
      Trigger 
      &  \phantom{0}1.1	
      &  1.1	
      &  \phantom{0}1.1	
      \\
      \hline
      Sum in quadrature 
      &  14.1 
      &   8.5 
      &  \phantom{0}8.5
  \end{tabular*}
\end{document}
