\begin{table}%T6
\caption{\label{table6}Atomic data.}
\small%\centering
\par
\begin{tabular}{lllll}
\hline\hline
	&  \multicolumn{2}{c}{CELs} 			&  \multicolumn{2}{c}{ORLs}	\\		       
Ion 	& Trans. Probabilities 	& Coll. strengths	& Eff. recomb. coeffs.     	 & Comments 	\\
\hline
C$^{++}$&	\nodata 	&	\nodata 	&  \citet{daveyetal00}  	& Case B	\\
C$^{3+}$&	\nodata 	&	\nodata 	&  \citet{pequignotetal91}	& Case A	\\
C$^{4+}$&	\nodata 	&	\nodata 	&  \citet{pequignotetal91}	& Case A	\\
N$^{+}$	& \citet{wieseetal96}	& \citet{lennonburke94}	&	\nodata 		&		\\
N$^{++}$&	\nodata 	&	\nodata 	&  \citet{kisieliusstorey02}	& Case B; triplets\\
	&			&			&  \citet{escalantevictor90}	& Case A; singlets\\
N$^{3+}$&	\nodata		&	\nodata		&  \citet{pequignotetal91}	& Case A	\\
O$^{+}$	& \citet{zeippen82}	& \citet{pradhanetal06}	&	\nodata			&		\\
O$^{++}$& \citet{wieseetal96}	& \citet{aggarwalkeenan99}&   \citet{storey94}		& Case B; quartets\\
	& \citet{storeyzeippen00}&			&   \citet{liuetal95}		& Case A; doublets\\
O$^{3+}$&	\nodata		&	\nodata		&  \citet{pequignotetal91}	& Case A	\\
Ne$^{++}$& \citet{balujazeippen88}& \citet{mclaughlinbell00}&  Kisielius \& Storey (unpublished)& Case A; 
quartets\\
Ne$^{3+}$& \citet{zeippen82}	& \citet{giles81}	&   	\nodata			&	\\
Ne$^{4+}$&\citet{baluja85}	& \citet{griffinbadnell00}&	\nodata			&	\\
S$^{+}$	&\citet{mendozazeippen82a}& \citet{keenanetal96}&	\nodata			&	\\
S$^{++}$&\citet{mendozazeippen82a}& \citet{tayalgupta99}&	\nodata			&	\\
Cl$^{++}$&\citet{mendoza82}	& \citet{mendoza83}	&	\nodata			&	\\
Cl$^{3+}$&\citet{mendozazeippen82a}& \citet{galavisetal95}&	\nodata			&	\\
	&\citet{kaufmansugar86}&			&	\nodata			&	\\
Ar$^{++}$&\citet{mendozazeippen83}& \citet{galavisetal95}&	\nodata			&	\\
Ar$^{3+}$&\citet{mendozazeippen82a}& \citet{ramsbottometal97}&	\nodata			&	\\
Ar$^{4+}$&\citet{mendozazeippen82a}&\citet{galavisetal95}&	\nodata			&	\\
\hline
\end{tabular}
\end{table}