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\begin{document}
\small
\begin{tabular}{r@{\hspace{1mm}--\hspace{1mm}}l|r@{\hspace{1mm}$\pm$\hspace{1mm}}l|c|r@{\hspace{1mm}$\pm$\hspace{1mm}}l|c}
\multicolumn{2}{c|}{} & \multicolumn{3}{|c|}{ $\tau^-\rightarrow\xspace \bar{p}\mu^+\mu^-$ \xspace} & \multicolumn{3}{c}{ $\tau^-\rightarrow\xspace p\mu^-\mu^-$ \xspace}\\
\hline
\multicolumn{2}{c|}{ $ {\rm \mathcal{M}_{3body}}$ \xspace} & \multicolumn{2}{c|}{Expected} & Observed & \multicolumn{2}{c|}{Expected} & Observed\\
\hline
$-$0.05 & 0.20 &  37.9 & 0.8 & 43 & 41.0 & 0.9 & 41 \\\hline
0.20 & 0.40 & 12.6 & 0.5 & 8 & 11.0 & 0.5 & 13 \\\hline
0.40 & 0.70 & 6.76 & 0.37 & 6 & 7.64 & 0.39 & 10 \\\hline
0.70 & 1.00 & 0.96 & 0.14 & 0 & 0.49 & 0.12 & 0 \\
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\end{document}
