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\begin{document}
\begin{tabular}{lccccccc}
\hline\hline
Mode    &                    ${\cal{B}}$ upper limit  &  Approx. limits as function of $M_N$ \\\hline
$D^+\mu^-\mu^-$ & $6.9\times 10^{-7}$ &\\
$D^{*+}\mu^-\mu^-$ & $ 2.4\times 10^{-6}$ &\\
$\pi^+\mu^-\mu^-$ &  $1.3\times 10^{-8}$ & $(0.4-1.0)\times 10^{-8}$ \\
$D_s^+\mu^-\mu^-$ & $5.8\times 10^{-7}$ & $(1.5 - 8.0)\times 10^{-7}$\\
$D^0\pi^+\mu^-\mu^-$ &  $1.5\times 10^{-6}$ &$(0.3-1.5)\times 10^{-6}$\\
\hline\hline
\end{tabular}
\end{document}
