\begin{table}%t7
\caption{Abundances in \IZ~NW compared to solar and Galactic halo stars.}\label{tab_ab}
\small%%\centerline
\par
 {
\begin{tabular}{l|c|cc|c|cc}
\hline\hline
   &      &     X/O & X/O    &  [X/H]  & [X/Fe] &    [X/Fe]    \\
El.& $M$$^a$&   $M$ & IT$^b$ &   $M$   &   $M$  &    H$^c$     \\
\hline
C  & 6.55 & $-$0.66 &$-$0.77 & $-$1.84 & $-$0.02&$-$0.05 $\pm$ 0.15\\
N  & 5.60 & $-$1.61 &$-$1.56 & $-$2.18 & $-$0.36&$-$0.40 $\pm$ 0.30\\
O  & 7.21 &    $-$  &  $-$   & $-$1.45 & \ 0.37 &\ 0.52 $\pm$ 0.15 \\
Ne & 6.39 & $-$0.82 &$-$0.80 & $-$1.45 & \ 0.37 &    $-$     \\
Si & 5.89 & $-$1.32 &$-$1.46 & $-$1.62 & \ 0.20 &\ 0.21 $\pm$ 0.08\\
S  & 5.57 & $-$1.64 &$-$1.55 & $-$1.57 & \ 0.25 &\ 0.21 $\pm$ 0.07\\
Ar & 4.97 & $-$2.24 &$-$2.16 & $-$1.55 & \ 0.27 &    $-$     \\
Fe & 5.63 & $-$1.58 &$-$1.45 & $-$1.82 &   $-$  &    $-$     \\
\hline
\end{tabular}}
\medskip
$^a$ 12 + log~(X/H) by number in present model $M$.\\
$^b$ Empirical abundance: Izotov \& Thuan (\cite{izo98}, 1999) with 12~+ log~(O/H)~= 7.16; Fe: Thuan \& Izotov (\cite{thu05}).\\
$^c$ Halo stars [Fe/H] $\sim$ $-1.8$: Fabbian et~al. (\cite{fab06}); Garc\'ia~P\'erez et~al. (\cite{gar06}); Nissen et~al. (\cite{nis07}); Carbon et~al. (\cite{car87}).
\end{table}