\begin{table}%t8
\caption{\label{tab8}Comparison of abundances in \object{M~1-42}.}
\small%\centerline
{
\begin{tabular}{lrrrrrr}
\hline
\hline
Elem.  & Present & Liu   & Exter & Aller  & Solar & N6153 \\ 
\hline  
He & 0.161  & 0.148 & 0.151 & 0.17 &  0.098 & 0.14  \\
C(--4)  & 10.5 & 0.63 &   &    &  2.5 & 6.8 \\
N(--4)  & 7.5  & 4.8  & 3.2  & 8.2 &  0.84 & 4.8 \\
O(--4)  & 8.3 & 4.3 & 3.0  & 4.7  &  4.6  & 8.3 \\
Ne(--4) & 4.4 & 1.3 & 1.2 &  1.35 & 1.2 & 3.1 \\
S(--5)  & 2.8 & 1.2 & 0.71  & 1.9 & 1.4 & 1.9 \\   
Ar(--6) & 9.0 & 3.7 & 3.4 &  4.6 &   4.2 & 8.5 \\
Cl(--7) & 6.1 & 1.9 &     & 7.1 & 3.2  & 5.6 \\
\hline  
\end{tabular}}
\smallskip
References: Liu: Liu et~al. (\cite{liu2}); Exter: Exter et~al. (\cite{exter}); Aller: Aller \& Keyes (\cite{aller});  Solar:
Asplund et~al. (\cite{asplund}); N6153: Pottasch et~al. (\cite{6153}).
\end{table}