\begin{table}%T2
\caption{\label{tab2}Comparison between CLOUDY abundance determinations with either 
blackbody central star and a constant density, with model atmosphere by Rauch (\cite{rauch}), and with~BB and a density falling off as~$r^{-2}$ (two~PNe). The last raw gives the ICF abundance determinations~(M~03).}  
%\centerline
{
\begin{tabular}{r l r r r r r}    
\hline  \hline  
Id & Method & He/H &~N/H &~O/H & S/H & Ar/H \\
\hline
91 & CL$_{\rm BB}$	        & 11.31 &7.86 &8.61 &6.42 	 &6.26\\
   & CL$_{\rm rauch}$	& 11.20 &8.01 &8.64 &6.52	 &6.25\\
   & CL$_{{\rm BB+d}\propto r^{-2}}$ & 11.31 &8.07 &8.48 &6.60        &6.18\\ 
   &ICF$_{\rm {M~03}}$	& 11.28 &7.83 &8.70 &6.61$\dag$  &6.32\\
\hline 
93 & CL$_{\rm BB}$               & 11.00 &7.53 &8.69 &6.46	      &6.17\\
   & CL$_{\rm rauch}$     	     & 10.92 &7.55 &8.60 &6.44	      &6.13\\	
   & CL$_{{\rm BB+d}\propto r^{-2}}$             & 10.93 &7.75 &8.47 &6.66        &6.09\\
   &ICF$_{\rm {M~03}}$       & 11.00 &7.50 &8.85 &6.44$\dag$ &6.36\\
\hline
101 & CL$_{\rm BB}$               & 11.07&7.33 &8.76 &6.18       &6.27\\
    & CL$_{\rm rauch}$     	      & 11.14&7.34 &8.70 &6.13       &6.22\\
    &ICF$_{\rm {M~03}}$        & 11.15&7.21 &8.72 &6.32$\dag$ &6.45\\
\hline
\end{tabular} }
\smallskip
$\dag$ See text.
\end{table}