\begin{table}%t1
%\centering
\par
\caption {\label{tab1}Some parameters of the considered model of stellar \mbox{perturbations}.}
% $i$ is the serial number of the representative stellar type (specified
% in the second column), $M_{*i}$ is the typical mass of $i$-th stellar type
% (in solar masses), $r_{o,i}$ is the radius of the $i$-th type sphere of
% influence (in AU), and $N_{*i}$ is the total number of $i$-type stars,
% which cross their sphere of influence during the considered period of
% $1~$Gyr.
\begin{tabular}{rccrr}
\hline \hline
 $i$ & Type & $M_{*i}$ & $r_{{\rm o},i}$ & $N_{*i}$ \\
\hline
 1 & B0 & 13.2 & 1~973~000 &  418 \\
 2 & A0 &  2.4 &  803~000 &  343 \\
 3 & A5 & 1.86 &  691~000 &  434 \\
 4 & F0 & 1.55 &  568~000 & 1168 \\
 5 & F5 & 1.32 &  482~000 &  450 \\
 6 & G0 & 1.12 &  416~000 &  909 \\
 7 & G5 & 0.98 &  389~000 & 1228 \\
 8 & K0 & 0.82 &  384~000 & 1177 \\
 9 & K5 & 0.68 &  311~000 & 1924 \\
10 & M0 & 0.52 &  285~000 & 2464 \\
11 & M5 & 0.27 &  204~000 & 6249 \\
12 & WD & 0.6  &  242~000 &  983 \\
13 & gs. & 2.2 &  580~000 &  503 \\
\hline  
\end{tabular}
% \begin{list}{}{}
% \item[$^{{\rm a}}$] This is footnote a
% \end{list}
\end{table}