\begin{table}%t3
\caption{\label{tab3}Parameters of some typical hot subdwarfs and their progenitors.}
%%\centerline

{\small
\begin{tabular}{lcccc}
\hline \hline $M_{\rm 1i}$ / $M_{\rm f}($\rm type$)$  & $q_{\rm i}$
& $P_{\rm i}$ / $P_{\rm f}$
 & $M_{\rm env}$  & $t_{\rm age}$ \\
($M_{\odot}$) &  & (days) & ($M_{\odot}$) & (yrs) \\
\hline
   conservative case:  \\
   3.55/0.38(sdB)   & 1.1  &   1.5/151.1   &   0.02  & $3.8\times 10^{8}$\\
   3.55/0.56(sdB)   & 1.1  &   3.5/116.1   &   0.04  & $0.9\times 10^{8}$\\
   3.55/0.53(sdB)   & 4.0  &   3.5/11.5    &   0.04  & $1.1\times 10^{8}$\\
   5.01/0.54(sdB)  & 1.1  &   1.6/147.8   &   0.04  &  $1.0\times 10^{8}$\\
   5.01/0.65(sdOB)   & 1.1  &   2.5/137.3   &   0.05 & $0.6\times 10^{8}$\\
   5.01/0.93(sdO)  & 1.1  &   15.7/317.2   &   0.09  & $0.2\times 10^{8}$\\
   5.01/1.01(sdOB)  & 1.1  &   31.3/483.8   &   0.12 & $0.2\times 10^{8}$\\
   5.01/1.06(sdB)   & 1.1  &   40.6/545.5   &   0.16 & $0.1\times 10^{8}$\\
   5.01/0.84(sdO)   & 4.0  &   5.1/13.1    &   0.08  & $0.2\times 10^{8}$\\
   5.01/0.91(sdO)   & 4.0  &   32.3/60.8    &   0.09 & $0.2\times 10^{8}$\\
\hline
   non-conservative case:  \\
   3.55/0.33(sdB)   & 1.1   &   1.5/27.9   &   0.01  & $7.9\times 10^{8}$\\
   3.55/0.54(sdB)   & 1.1   &   3.5/29.4   &   0.04  & $1.0\times 10^{8}$\\
   3.55/0.53(sdB)   & 4.0   &   3.5/6.9    &   0.04  & $1.1\times 10^{8}$\\
   5.01/0.46(sdB)  & 1.1  &   1.6/27.2   &   0.03  & $1.7\times 10^{8}$\\
   5.01/0.61(sdOB)   & 1.1  &   2.5/29.0   &   0.05  & $0.7\times 10^{8}$\\
   5.01/0.91(sdO)  & 1.1  &   15.7/100.5   &   0.09  & $0.2\times 10^{8}$\\
   5.01/0.98(sdOB)  & 1.1  &   41.6/483.2   &   0.12  & $0.2\times 10^{8}$\\
   5.01/1.00(sdB)   & 1.1  &   43.6/526.0   &   0.14  & $0.1\times 10^{8}$\\
   5.01/0.84(sdO)   & 4.0  &   5.1/9.1    &   0.08  & $0.3\times 10^{8}$\\
   5.01/0.91(sdO)   & 4.0  &   32.3/59.4    &   0.09  & $0.2\times 10^{8}$\\
\hline
\end{tabular}}
\medskip
\par
$M_{\rm 1i} =$ initial mass; $M_{\rm f}
=$ the mass of hot subdwarfs; $q_{\rm i} =$ the mass ratio; $P_{\rm
i} =$ initial orbital period; $P_{\rm f} =$ orbital period of hot
subdwarf binaries; $M_{\rm env} =$ the envelope mass of hot
subdwarfs; $t_{\rm age} =$ the lifetime of a hot subdwarf. More
parameters can be seen from Figs.~\ref{fig2}, \ref{fig3}, and 6--9. 
\end{table}