\begin{table}%t1
\caption{\label{t:widths}Nuclear data for the two steps of the $3\alpha$-reaction.}
%\centering
\par
\begin{tabular}{ccccc}
  \hline
  \hline\noalign{\smallskip}
 Nucleus&$J^{\pi}$&$E_R$ (keV)&$\Gamma_{\alpha}$ (eV)&
$\Gamma_{\gamma}$ (meV) \\
\hline\noalign{\smallskip}
$^8$Be&$0^+$& $91.84 \pm 0.04$&$5.57 \pm 0.25$   &$-$  \\
$^{12}$C&$0^+_2$&$287.6 \pm 0.2$& $8.3\pm1.0$ &$3.7\pm0.5$ \\[2pt]
\hline
\end{tabular}
\tablefoot {See text for the definitions of the quantities.\vspace*{-2mm}}
\tablebib{\citep{TKG04,Ajz90,audi03}.}
\end{table}