\begin{table}%t2
\caption{\label{t:2}Logarithmic element abundances within the metal group.}
%\centerline
 {\small \begin{tabular}{rcc}
\hline\hline\noalign{\smallskip}
El.$^a$ &  Solar$^b$  & $\alpha$-enhanced$^c$ \\
\hline
C & 8.55 & 8.55 \\
N & 7.97 & 7.97 \\
$^\ast$O & 8.87 & 9.27 \\
$^\ast$Ne & 8.07 & 8.47 \\
Na & 6.33 & 6.33 \\ 
$^\ast$Mg & 7.58 & 7.98 \\ 
Al & 6.47 & 6.47 \\ 
$^\ast$Si & 7.55 & 7.95 \\ 
P & 5.45 & 5.45 \\
$^\ast$S & 7.21 & 7.61 \\
Cl & 5.50 & 5.50 \\ 
Ar & 6.52 & 6.52 \\ 
K & 5.12 & 5.12 \\
$^\ast$Ca & 6.36 & 6.76 \\ 
$^\ast$Ti & 5.02 & 5.42 \\ 
Cr & 5.67 & 5.67 \\
Mn & 5.39 & 5.39 \\
Fe & 7.51 & 7.51 \\
Ni & 6.25 & 6.25 \\
\hline
\end{tabular}}
\medskip
$^a$ $\alpha$-elements are marked with an asterisk; $^b$~\citet{seaton:92,GN:93}; $^c$ an $\alpha$-enhancement of +0.4~dex was assumed. 
\end{table}