\begin{table}%t1
%\centering
\par
\caption{Hydrodynamical sequences of model planetary   nebulae.\label{Tab.1}}
\begin{tabular}{rcccc}
\hline\hline
\noalign{\smallskip}
No. & $M $            & $\dot{M}_{\rm agb}$       & $V_{\rm agb}$ & T{\sc ype}   \\
\noalign{\smallskip}
    & ${M}_{\sun}$& ${M}_{\sun}/{\rm yr}$ &   km~s$^{-1}$        &       \\
\noalign{\smallskip}  
\hline\noalign{\smallskip}          
   21    &  0.565     & $ 1\times 10^{-5} $         &  10	   & {\sc a}\\
   22    &  0.565     & $ 3\times 10^{-5} $         &  10	   & {\sc a}\\
\noalign{\medskip}
    2    &  0.605     & $ 1\times 10^{-5} $         &   5	   & {\sc a}\\
    3    &  0.605     & $ 3\times 10^{-5} $         &  10	   & {\sc a}\\
    4    &  0.605     & $ 1\times 10^{-4} $         &  10	   & {\sc a}\\
    5    &  0.605     & $ 1\times 10^{-4} $         &  15	   & {\sc a}\\ 
    6    &  0.605     & "Hydro.''\ simulation      &               & {\sc c}\\    
\noalign{\medskip}
    7    &  0.625     & "Kinem.''\ simulation      &  10           & {\sc b}\\
    8    &  0.625     & $ 1\times 10^{-4} $         &  15	   & {\sc a}\\
\noalign{\medskip}
    9    &  0.696     &  "Kinem.''\ simulation     &  10           & {\sc b}\\
   10    &  0.696     & $ 1\times 10^{-4} $         &  15           & {\sc a}\\
\noalign{\medskip}
   11    &  0.836     & $ 1\times 10^{-5} $         &  15           & {\sc a}\\ 
   12    &  0.836     & $ 1\times 10^{-4} $         &  15           & {\sc a}\\
\noalign{\medskip}
   13    &  0.940     & $ 1\times 10^{-5} $         &  15           & {\sc a}\\
   14    &  0.940     & $ 1\times 10^{-4} $         &  15           & {\sc a}\\
\hline
\end{tabular}
\end{table}