\begin{table}%t1
\caption{Chemical composition of stellar models with total metallicity~$Z$, initial helium~$Y_0$,
hydrogen abundance~$X_0$, iron abundance with respect to
hydrogen (in spectroscopic notation~[Fe/H]) and  total metallicity with respect to hydrogen~[M/H].}
\label{t:1}
%\centering
\small	
\begin{tabular}{r|rrrr}
\hline\hline
$Z$ & $Y_0$ & $X_0$ & [Fe/H]& [M/H] \\ \hline
$2\times10^{-4}$ & 0.2455 & 0.7543 & --2.26& --1.97 \\
$3\times10^{-4}$ & 0.2458 & 0.7539 & --2.08& --1.79 \\
$6\times10^{-4}$ & 0.2465 & 0.7529 & --1.78& --1.49 \\
$10^{-3}$ & 0.2475 & 0.7515 & --1.56& --1.27 \\
$2\times10^{-3}$ & 0.2500 & 0.7480 & --1.25& --0.96 \\
$3\times10^{-3}$ & 0.2525 & 0.7445 & --1.07& --0.78 \\
$6\times10^{-3}$ & 0.2600 & 0.7340 & --0.77 &--0.48 \\
$10^{-2}$ & 0.2700 & 0.7200 & --0.54 &--0.25\\
\hline
\end{tabular}
\end{table}