\begin{table}%t2
\caption{\label{times}Lifetimes of nuclear burning.}                  
%\centering
\par
\begin{tabular}{ccccc}     % 7 columns 
\hline\hline       
                     % To combine 4 columns into a single one 
Model &  H-burning            & He-burning             &  C-burning   & Ne-burning  \\
      &  ($\times 10^6$ yr)  & ($\times 10^5$ yr)    &   (yr)      &   (yr)     \\
\hline                    
 23 \Mo  &   6.374   &  6.01  &  7 243   &  3.64  \\
 28 \Mo  &   5.252   &  5.89  &  2 238   &  1.85  \\
 29 \Mo  &   5.100   &  5.45  &  2 079   &  1.19   \\
 30 \Mo  &   4.959   &  5.15  &  3 286   &  0.55   \\
 33 \Mo  &   4.607   &  5.10  &  3 576   &  1.29   \\
\hline                  
\end{tabular}
\end{table}