\begin{table}%T3
   %\centering
\small
      \caption{Upper lifetime limits 
             $T_{\rm{max}}$ at different significance levels
               for 1612~MHz OH masers, based on 
               observations of the Arecibo sample. $Q_n^m$ is the 
               probability for finding at least $m$ extinguished masers among
               $n$ stars reobserved after $\Delta t$ years.}
         \label{lB-prob}
         \begin{tabular}{rrrrrll}
            \hline\hline
            %\noalign{\smallskip}
             $n$ & $m$ &$\Delta t$& $T_{\rm{max}}$ & $Q_n^m$ & \multicolumn{2}{l}{Comments} \\
            %\noalign{\smallskip}
                 &     & [yr]     & [yr]    &  [\%]    &     &  \\
            %\noalign{\smallskip}
            \hline
            %\noalign{\smallskip}
%            112  &  3  &  12 &  5100 &  0.2  &  3$\sigma$ & Arecibo   \\
            112  &  4  &  12 &  2410 &  0.2  &  3$\sigma$ & Arecibo   \\
%            112  &  3  &  12 &  1690 &  4.6  &  2$\sigma$ & sample \\
            112  &  4  &  12 &  1005 &  4.6  &  2$\sigma$ & sample \\
%            112  &  3  &  12 &   686 & 31.2  &  1$\sigma$ &   \\
            112  &  4  &  12 &   476 & 31.2  &  1$\sigma$ &   \\
            %\noalign{\smallskip}
            \hline
         \end{tabular}
   \end{table}