\begin{table}%t3
%\centering
\par
 \caption{Constraints on the Galactic NSM rate $f_{{\rm NSM}}$ and ejected 
          \mbox{r-process} matter $M_{\rm r}$. \label{nsmcons}}
 \begin{tabular}[]{lc} 
 \hline\hline
     Reference & $f_{{\rm NSM}} ~ [{\rm yr}^{-1}]$ \\
  \hline
     van den Heuvel \& Lorimer (\cite{vdH96})  & $8 \times 10^{-6}$\\
     Kalogera \& Lorimer (\cite{ka00}) & $\le$$( 7.5 \times 10^{-7}{-}1.5 \times 10^{-5} )$ \\
     Belczynski et~al. (\cite{bl02})   & $10^{-6}$--$3 \times 10^{-4}$  \\
  \hline
     Reference & $M_{\rm r}$ $[~ {M}_{\odot}]$\\
  \hline
     Rosswog et~al. (\cite{ro99}) & $10^{-3}$--$10^{-2}$\\
     Oechslin et~al. (\cite{oe02}) & $\ge$$( 5 \times 10^{-5}{-}2 \times 10^{-4} )$\\
  \hline
 \end{tabular}
\end{table}