\begin{table}%t3
\caption{Helium and silicon abundances of the model grid.}
\label{hesia}
%\centering
\small
\begin{tabular}{crrrrrrrrrrr}
\hline \hline
 [He/H] & --6 & --5 & --4 & --3 & --2 & --1 & 0 & 1 & 2 & & 3\\\relax
 [Si/H] &&&& --3 & --2 & --1 & 0 & 1 & 2 & 2.5 & 3\\
\hline
\end{tabular}
\end{table}