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\begin{document}

\begin{tabular}{lrrrrrr}\hline
Source& \multicolumn{2}{c}{ $\kern 0.18em\overline{\kern -0.18em  B\xspace}{}\xspace^0$ \xspace} & \multicolumn{2}{c}{ $\kern 0.18em\overline{\kern -0.18em  B\xspace}{}\xspace^0_ s\xspace\xspace$ \xspace}  & \multicolumn{2}{c}{Ratio} \\
      &  + & --  & + &  -- &  + & --\\\hline
Mass \& width of $f_1$ & 2.0 &2.0 & 2.7 &2.7 &1.5 & 1.5\\
Shape of high mass & 0.6 &0&0&3.7&0&3.8\\
Efficiency & 2.0&2.0&2.0&2.0& 0&0\\
Tracking &  2.0&2.0&2.0&2.0& 0&0\\
Simulation statistics & 2.0 & 2.0& 2.0&2.0&0&0\\\hline
Total & 4.0&4.0&4.4&5.7&1.5&4.1\\
\hline
\end{tabular}
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