\begin{table}%t4
\caption {Abundance ratios (in number) of HD~45166 compared to\protect different object classes.
\label{abund_comp}}
%\centerline
 {
\begin{tabular}{c c c c c}
\hline\hline
Object & He/H  & C/N & O/N & Reference\\
\hline
HD~45166	 & 	   0.5 	          &    1.5		 & 	 0.75   & 1 \\
Sun		  &	   0.085	  &   8.6		  &	 7.2    &  2 \\	 
PN I		 & 	   0.14 	  &   0.7--3		 & 	 1.2    &  3\\
PN II            &         0.11       &   1.4--9  &  3.5    & 3\\
WNL		 & 	   H-free	  &    0.04		 & 	 \ldots     &  4\\
WNE		  &	   H-free	  &   0.02		  &	 \ldots    &  4\\
WNEw	          &	   1.5  	  &   0.005		  &	 0.05   &  4\\
\hline
\end{tabular}}
 \smallskip References:  (1) this work; (2) \citet{grevesse07}; (3) \citet{peimbert90}; (4) \citet{crowther07}.
\end{table}