\begin{table}%t1
\caption{Theoretical abundances in the standard model.} 
\label{standard-abundances}
%\centering
\par
\begin{tabular}{cc}
\hline \hline
Nucleus & Our code  \\ 
\hline
%& \\[-8pt]
$\De$&$2.569 \times 10^{-5}$
\\   
$\He$&$0.248$\\ 
$\Li$&$4.514 \times 10^{-10}$\\ 
\hline
\end{tabular}
\end{table}