\begin{table}%t4
%\centering
\par
\caption{Low degree $p$-mode frequencies (in $\mu$Hz) for the best model (model M2) of $\alpha$~Cen~A and B. The observations are from Bouchy \& Carrier (\cite{bo02}) for
$\alpha$~Cen~A and from Carrier \& Bourban (\cite{ca03}) for $\alpha$~Cen B.}
\label{tab:freq}
\begin{tabular}{cc|ccc|cccc}
\hline
\hline
 & & \multicolumn{3}{|c|}{Observations} & \multicolumn{4}{c}{Model M2}  \\
 & $n$ & \multicolumn{1}{|c}{$l=0$} & \multicolumn{1}{c}{$l=1$} & \multicolumn{1}{c}{$l=2$} & \multicolumn{1}{|c}{$l=0$} & \multicolumn{1}{c}{$l=1$} & \multicolumn{1}{c}{$l=2$} & \multicolumn{1}{c}{$l=3$} \\ \hline
 & 15 & 	& 	 	& 1833.1 & 1717.8 & 1764.7	      & 1814.0	 & 1857.8 \\ 	      
 & 16 & 1841.3 	& 1887.4 	& 1934.9 & 1820.7 & 1868.4	      & 1917.9	 & 1962.0 \\
 & 17 & 	& 1991.7 	& 2041.5 & 1924.2 & 1972.4	      & 2022.9	 & 2067.7 \\
 & 18 &		& 2095.6	& 2146.0 & 2029.1 & 2077.7	      & 2128.1	 & 2173.6 \\
 & 19 & 2152.9	& 2202.8	& 2251.4 & 2134.0 & 2183.4	      & 2233.8	 & 2279.1 \\
$\alpha$~Cen~A & 20 & 2258.4	& 2309.1	& 2358.4 & 2239.3 & 2288.5	      & 2339.4	 & 2385.2 \\
 & 21 & 2364.2	& 2414.3 	& 2464.1 & 2344.6 & 2394.2	      & 2444.8	 & 2491.2 \\ 
 & 22 & 2470.0	& 2519.3	& 2568.5 & 2449.7 & 2500.0	      & 2551.0	 & 2597.4 \\
 & 23 & 2573.1	& 2625.6	& 	 & 2555.5 & 2605.8	      & 2657.3	 & 2704.3 \\
 & 24 &	2679.8  & 2733.2	& 2782.9 & 2661.5 & 2712.4	      & 2763.6	 & 2810.9 \\
 & 25 &	2786.2	& 2837.6	& 2887.7 & 2767.5 & 2818.6	      & 2870.3	 & 2917.5 \\ 										      
\hline
 & 17 & 	& 3052.0	& 	 & 2977.2 & 3053.2	      & 3125.6	 & 3194.2 \\ 	      
 & 18 &  	& 	 	& 	 & 3136.7 & 3213.2	      & 3286.2	 & 3355.1 \\
 & 19 & 	& 	 	& 	 & 3296.9 & 3373.4	      & 3446.8	 & 3516.3 \\
 & 20 &		& 3532.9	& 3607.2 & 3457.2 & 3534.0	      & 3607.5	 & 3677.4 \\
 & 21 & 3617.2	& 		& 	 & 3617.6 & 3694.5	      & 3768.5	 & 3838.8 \\
$\alpha$~Cen B  & 22 & 	& 3855.0	& 3930.6 & 3778.2 & 3855.4	      & 3929.8	 & 4000.7 \\ 
 & 23 & 3937.6	& 4016.3 	& 	 & 3939.2 & 4016.8	      & 4091.5	 & 4163.0 \\ 
 & 24 & 	& 4177.4	& 4253.8 & 4100.6 & 4178.6	      & 4253.7	 & 4325.4 \\
 & 25 & 	& 		& 	 & 4262.6 & 4340.6	      & 4415.9	 & 4488.2 \\
 & 26 &	4423.1  & 		& 	 & 4424.6 & 4502.8	      & 4578.3	 & 4650.7 \\
 & 27 &	4585.0	& 		& 	 & 4586.7 & 4665.0	      & 4740.8	 & 4813.5 \\     
\hline
\end{tabular}
\end{table}