\begin{table}%t9
\caption{\label{tab9}Comparison of abundances in \object{NGC~2792}.}
\small
\par
%\centerline
{\begin{tabular}{llllllll}
\hline
\hline
Ele.  & Empir. & Model  & HKB   &  KB  &  TPP  &  dFP  & Solar  \\ 
\hline  
He     & 0.103  & 0.10 & 0.11  & 0.098  & 0.107  & 0.115  & 0.098   \\
C(--4)  &  1.1   & 0.8  &       &  8.4   &        &       & 2.5   \\
N(--5)  &  6.8   & 4.37  &  14  & 36:   &  8.0:    &       & 6.0  \\
O(--4)  &  2.1   & 2.1   &  7.65 & 5.74  & 6.0:  &   5.6   & 4.6  \\
S(--6)  &  4.3   & 4.45  &  5.3  &       &        &        & 14 \\   
Ar(--6) &  1.6   & 1.63  &  6.4  &  2.2  &       &   1.7   & 4.2  \\
Ne(--5) &  7.4   & 6.3   &  12   &  12.9  & 9.5: &        & 12 \\
Cl(--7) &  0.90   & 1.12  &  5.2  &       &       &        &  3.5 \\
Si(--6) &  2.0:  & 2.85   &       &       &       &        & 32 \\
Mg(--5) &  1.0:  & 1.07  &       &       &       &        & 3.4 \\
\hline  
\end{tabular}}
\medskip
References: HKB: Henry et~al. (\cite{henry}), KB: Kingsburgh \& Barlow 
(\cite{kings}), TPP: Torres-Peimbert \& Peimbert (\cite{tpp}), dFP: de~Freitas
Pacheco et~al. (\cite{dfp}), Solar: Grevesse et~al. (\cite{grev}).
The numbers in parentheses are the powers of ten used in the other columns.
\par
  \end{table}