\begin{table}%t3
%\centering
\par
\caption{\label{logteff_xc}The ZAMS ({\it left panel}) and TAMS ({\it right panel}) for [$Z$]~=~0.02 and different core Hydrogen abundances ($X_{\rm c}$).}
\begin{tabular}{ccccccc}
\hline
\hline
\noalign{\smallskip}
$X_{\rm c}$ & 0.6 & 0.7 & 0.8 & 0.6 & 0.7 & 0.8 \\
\hline
$\log L/L_{\odot}$ & \multicolumn{3}{c}{$\log T_{\rm eff}$} 
& \multicolumn{3}{c}{$\log T_{\rm eff}$} \\
0.3 & 3.815 & 3.798 & 3.785 & 3.798 & 3.780 & 3.764 \\
1.2 & 3.967 & 3.953 & 3.938 & 3.829 & 3.803 & 3.785 \\
2.1 & 4.131 & 4.118 & 4.107 & 3.975 & 3.939 & 3.902 \\
3.0 & 4.289 & 4.277 & 4.266 & 4.142 & 4.103 & 4.065 \\
\hline
\end{tabular}
\end{table}