\begin{table}%t4
{
\caption{\label{Tab4}Total abundances for PNe and \ion{H}{ii}  regions in NGC~6822  and other galaxies$^1$.}
%\centerline
 {\small \begin{tabular}{llllllll}
\hline \hline\noalign{\smallskip}
Object&  He/H  &O/H&~~N/H& Ne/H& S/H& Ar/H& Other IDs$^2$ , comments$^3$\\
\hline 
PN~12& 0.113 $\pm$ 0.009 &8.26 $\pm$ 0.10 & 7.57 $\pm$ 0.13 & 7.44 $\pm$ 0.10 &6.62 $\pm$ 0.15 & 5.83 $\pm$ 0.10 & PN14-S14, young\\
PN~16& 0.148 $\pm$ 0.010 &8.25 $\pm$ 0.08 &7.16 $\pm$ 0.20 &7.51 $\pm$ 0.10 &6.02 $\pm$ 0.20 &5.82 $\pm$ 0.12 & PN13-S16, young\\
PN~7& 0.107 $\pm$ 0.015 &8.20 $\pm$ 0.15 &6.92 $\pm$ 0.17 &--&5.98 $\pm$ 0.20 &5.96 $\pm$ 0.13 & PN2, young\\
PN~6& 0.096 $\pm$ 0.005 &8.15 $\pm$ 0.07 &7.36 $\pm$ 0.15 &7.38 $\pm$ 0.12 &6.20 $\pm$ 0.29 &5.63 $\pm$ 0.10 & PN1, old\\
PN~14& 0.109 $\pm$ 0.006 &8.12 $\pm$ 0.08 &8.44 $\pm$ 0.14 & -- &5.89 $\pm$ 0.30 &5.81 $\pm$ 0.12 &  PN7-S33, Type I, young\\
PN~21& 0.106 $\pm$ 0.012 &7.95 $\pm$ 0.10 &7.24 $\pm$ 0.15 &7.21 $\pm$ 0.10 &$<$6.75&5.80 $\pm$ 0.12 &  PN12, young\\ 
PN~5& 0.094 $\pm$ 0.015 &7.90 $\pm$ 0.10 &8.36 $\pm$ 0.20 &--&6.64 $\pm$ 0.29 &5.88 $\pm$ 0.15 &  PN3, Type I, young\\
PN~4& 0.090 $\pm$ 0.005 &7.78 $\pm$ 0.07 &7.48 $\pm$ 0.12 &7.05 $\pm$ 0.10 &6.22 $\pm$ 0.15 &5.59 $\pm$ 0.10 &  PN4,  Type I?, old\\
PN~10& 0.111 $\pm$ 0.010 &7.60 $\pm$ 0.08 &6.30 $\pm$ 0.13 &6.80 $\pm$ 0.10 &--&5.20 $\pm$ 0.15 &  PN19, old\\
PN~19&0.145 $\pm$ 0.040 &7.57 $\pm$ 0.12 &6.42 $\pm$ 0.15 &--&6.22 $\pm$ 0.20 &5.63 $\pm$ 0.15 &  PN9, old\\
PN~18&$<$0.124 &7.49 $\pm$ 0.15 &--&6.82 $\pm$ 0.15 &--&--&  PN11, old\\
\hline
$\langle$non-type I$\rangle$& 0.114 $\pm$ 0.014  & 7.92 $\pm$ 0.18  & 7.06 $\pm$  0.31  & 7.17 $\pm$ 0.20  & 6.21 $\pm$ 0.17  & 5.68 $\pm$ 0.15 & Type~I~PNe excluded, 2$\sigma$ err\\
%\hline
\ion{H}{ii}~15 & 0.090 $\pm$ 0.005 &8.10 $\pm$ 0.05 &6.56 $\pm$ 0.08 &7.36 $\pm$ 0.07 &6.49 $\pm$ 0.10 &5.97 $\pm$ 0.08 & \ion{H}{ii}8-S28\\
H~V& 0.084 $\pm$ 0.002 &8.08 $\pm$ 0.03 &6.85 $\pm$ 0.15  &7.35 $\pm$ 0.03 &6.61 $\pm$ 0.05 & 5.84 $\pm$ 0.03 &   PPR\\
H~X& 0.084 $\pm$ 0.002 &8.01 $\pm$ 0.05 &6.76 $\pm$ 0.16 &7.27 $\pm$ 0.05  &6.51 $\pm$ 0.06  &5.84 $\pm$ 0.05 &  PPR\\
H~I & -- &		7.98 $\pm$ 0.09 & --	& 7.34 $\pm$ 0.19 &--&-- &		 LSV \\	
K$\alpha$ & -- & 8.00 $\pm$ 0.04 & 6.16 $\pm$ 0.10 & 7.51 $\pm$ 0.10 &--  & 6.04 $\pm$ 0.07& LSV\\
K$\beta$ & -- & 8.18 $\pm$ 0.07 & --& 7.60 $\pm$ 0.13 & --&-- &  LSV \\
KD28e	&-- &	8.19 $\pm$ 0.05 & 6.38 $\pm$ 0.06  &	7.64 $\pm$ 0.09 & --& 6.10 $\pm$ 0.05 &	 	 LSV\\
\hline
$\langle$\ion{H}{ii} regions$\rangle$&0.086 $\pm$ 0.004  &8.06 $\pm$ 0.04  &6.72 $\pm$ 0.14  & 7.33 $\pm$ 0.05  &6.54 $\pm$ 0.06  & 5.88 $\pm$ 0.07 & 3 best observed obj., 2$\sigma$ err \\	
%\hline  
LMC-\ion{H}{ii} & 0.085 &8.40 & 6.90  &7.60 & 6.70 & 6.20 & D89, G99\\ 
LMC-PNe& 0.091&8.33  &7.45 &7.54 & 6.93 &5.93& non-type I, LD06\\
SMC-\ion{H}{ii} & 0.079  & 8.00  & 6.50 & 7.20  & 6.30& 5.90&  D89, G99 \\
SMC-PNe&0.079 & 8.09  &7.11 &7.16 & 6.62  & 5.51 & non-type I, LD06\\
NGC3109-\ion{H}{ii} & 0.085 & 7.77  &6.44 &6.87 &6.39 & 5.83 & PSR\\
NGC3109-PNe  & 0.087 & 8.16  & 7.49 & 7.18  & 6.26  & 5.66 & PSR\\
Sun&0.085&8.66& 7.78 & 7.84& 7.14& 6.18& Grevese  et~al. (2007)\\
\hline 
\end{tabular}}}
\medskip
$^1$~Heavy elements in 12~+~log~(X/H), objects ordered by 12~+~log~(O/H) values; $^2$~IDs: PN\# from Leisy et~al. (\cite{leisy05}) and S\# from Killen \& Dufour (\cite{killen1982}); $^3$~Ref.: PPR: Peimbert et~al. (\cite{peimbert05}); LSV: Lee et~al. (\cite{lee2006}),  D89: Dennefeld (\cite{dennefeld1989}); G99: Garnett (\cite{garnet99});
 LD06: Leisy \& Dennefeld (\cite{leisy06}); PSR: Pe\~na et~al. (\cite{pena07}).
\end{table}