\begin{table}%t1
%\centering
\par
\caption{Non-asteroseismic constraints. References(1): \cite{Eggenberger04}; (2): \cite{Thoul03}.}
\label{tab:nonastero}
$$
\begin{tabular}{cr@{$\;\pm\;$}lr@{$\;\pm\;$}lc}
  \hline\hline
  &\multicolumn{2}{c}{A} & \multicolumn{2}{c}{B} & Ref. \\
\hline
$M$/\msol & 1.105&0.007& 0.934&0.006& (1) \\
\teff & 5810&50 & 5260&50 & (1)\\
$R$/\rsol & 1.224&  0.003 & 0.863&0.005& (1) \\
$L$/\lsol & 1.522&0.030 & 0.503&0.020&(1) \\
$Z/X$ & 0.039&0.006 &0.039&0.006& (2)\\
 \hline
 \end{tabular}
 $$
\end{table}