\begin{table}%t3
\caption{Elemental abundances of NGC~6309. ICFs were obtained
following Kingsburgh \& Barlow (\cite{kin94}). Comparison with mean values
of All-type PNe, type~I~PNe and other objects are shown. Except for
He, all the abundances relative to H are logarithmic values with $H$~=~+12.}\label{tboller3}
\small%\centerline
 {
\begin{tabular}{@{}lrrrrrrrrr}
\hline \hline
%&&&&&&&&& \\[-8pt]
Ion   & R1  & R2  & R3  & R4  & G04$^{{a}}$ & PNe$^{{b}}$  & 
TI~PNe$^{{c}}$ & \ion{H}{ii}$^{{d}}$  & Sun$^{{e}}$ \\        
\hline
He/H&$0.11\pm0.01$&$0.11\pm0.01$&$0.12\pm0.01$&$0.12\pm0.01$&
     $0.10\pm0.01$&$0.12\pm0.02$&$0.13\pm0.04$&$0.10\pm0.01$&$0.09\pm0.01$\\
O /H&$8.74\pm0.02$&$8.72\pm0.02$&$8.72\pm0.01$&$8.74\pm0.01$&
     $8.64\pm0.02$&$8.68\pm0.15$&$8.65\pm0.15$&$8.70\pm0.04$&$8.66\pm0.05$\\
N /H&$7.93\pm0.02$&$7.92\pm0.02$&$8.04\pm0.01$&$7.89\pm0.02$&
     $8.20\pm0.12$&$8.35\pm0.25$&$8.72\pm0.15$&$7.57\pm0.04$&$7.78\pm0.06$\\
Ne/H&$8.26\pm0.02$&$8.25\pm0.02$&-- &-- &
     $7.82\pm1.00$&$8.09\pm0.15$&$8.09\pm0.15$&$7.90\pm0.10$&$7.84\pm0.06$\\
Ar/H&$6.40\pm0.10$&$6.42\pm0.10$&$6.54\pm0.01$&$6.51\pm0.01$&
     --          &$6.39\pm0.30$&$6.42\pm0.30$&$6.42\pm0.04$&$6.18\pm0.08$\\
S /H&$6.74\pm0.01$&$6.73\pm0.01$&$6.84\pm0.01$&$6.87\pm0.01$&
     $6.49\pm0.05$&$6.92\pm0.30$&$6.91\pm0.30$&$7.06\pm0.06$&$7.14\pm0.05$\\
\hline
\end{tabular}}
\medskip
$^{{a}}$ Taken from G\'orny et~al. (\cite{gor04}).\\
$^{{b}}$ Average for PNe (Kingsburgh \& Barlow \cite{kin94}).\\
$^{{c}}$ Average for type I PNe (Kingsburgh \& Barlow \cite{kin94}). \\
$^{{d}}$ Average for \ion{H}{ii} regions (Shaver et~al. \cite{sha83}). \\
$^{{e}}$ The Sun (Grevesse et~al. \cite{gre07}).
\end{table}