\begin{table}%T5
\caption{\label{table5}Plasma diagnostic.}
\small%\centerline
{
\begin{tabular}{llccccc}
\hline\hline
Parameter & Lines 								& PB8 			& NGC~2867--1 		& NGC~2867--2 			& 
PB6--1		& PB6--2   		\\
\hline\noalign{\smallskip}
 {\elecd} (cm$^{-3}$)& {\fnitroi} ($\lambda$5198)/($\lambda$5200)		& \nodata 		& 1100~$\pm$~450  	& 
850~$\pm$~300			& \nodata		& \nodata		\\
& {\foii} ($\lambda$3726)/($\lambda$3729)					& 2650~$\pm$~750       	& 3050~$\pm$~800   	& 
2300~$\pm$~550	 	     	& 2050~$\pm$~600	       	& 2200~$\pm$~550	       	\\
& {\fsii} ($\lambda$6716)/($\lambda$6731)					& 2450~$\pm$~1000	       	& 3550~$\pm$~1200        	& 
2500~$\pm$~800	       	     	& 1750~$\pm$~900	       	& 2450~$\pm$~850	       	\\ 
& {\fcliii} ($\lambda$5518)/($\lambda$5538)					& 2400~$\pm$~1800	       	& 4750~$\pm$~1100        	& 
4750~$\pm$~1200	       	     	& \nodata	       	& \nodata	       	\\ 
& {\fariv} ($\lambda$4711)/($\lambda$4740) 					& $<$6850$^{c}$	& 6800:$^{c}$ 	& 3900~$\pm$~1000	       	     	
& 1650~$\pm$~1000	       	& 1750~$\pm$~950	       	\\
& {\elecd} (average) 								& 2550~$\pm$~550	       	& 4150~$\pm$~500		& 2850~$\pm$~400		 	
& 1900~$\pm$~450		& 2200~$\pm$~400		\\
& 				& 			& 			& 			     	&  		       	&  		       	
\\
$T_{\rm e}$ (K)& {\fnii} ($\lambda$6548+$\lambda$6583)/($\lambda$5755)		& 8900~$\pm$~500$^{a}$& 11~750~$\pm$~400        	
& 11~750~$\pm$~400         	& 12~350~$\pm$~950	       	& 12~800~$\pm$~550	       	\\
& {\fsii} ($\lambda$6716+$\lambda$6731)/($\lambda$4069+$\lambda$4076)		& \nodata        	& 8450:$^{d}$	
& 8250:$^{d}$	     	& \nodata	       	& \nodata	       	\\      
& {\foii} ($\lambda$3726+$\lambda$3729)/($\lambda$7320+$\lambda$7330)	 	& 7050~$\pm$~400$^{b}$& \nodata        	
& \nodata	         	& \nodata	       	& \nodata	       	\\
&  				& 		       	& 	        	& 	         	     	& 			& 			
\\
& {\foiii} ($\lambda$4959+$\lambda$5007)/($\lambda$4363) 			& 6900~$\pm$~150       	& 11~850~$\pm$~300        	
& 11~600~$\pm$~250         	& 15~750~$\pm$~600	       	& 15~300~$\pm$~500	       	\\
& {\fariii} ($\lambda$7136+$\lambda$7751)/($\lambda$5192)			& \nodata 	       	& 10~800~$\pm$~550  	& 
11~350~$\pm$~850         	& \nodata		& \nodata		\\      
&  				& 		       	& 	        	& 	         	     	&			& 
\\
& {\fariv} ($\lambda$4711+$\lambda$4740)/($\lambda$7170+$\lambda$7263)		& \nodata 	       	& 15~400:$^{c}$  	
& $>$19~870:        		& \nodata		& \nodata		\\      
&  				& 		       	& 	        	& 	         	     	& 
\\
& $T_{\rm e}$(N{\sc ii}+O{\sc iii})						& 7000~$\pm$~150       	& 11~850~$\pm$~250        	& 
11~600~$\pm$~300        		& 15~450~$\pm$~500		& 15~050~$\pm$~450 	\\
& {\hei} 									& 6250~$\pm$~150		& 10~900~$\pm$~250	        & 10~250~$\pm$~250	         	
& 13~250~$\pm$~550		& 13~250~$\pm$~450		\\
& Balmer Decrement 								& 5100$^{+1300}_{-900}$	& 8950$^{+2900}_{-1900}$& 
8950$^{+2900}_{-1900}$     	& \nodata	       	& \nodata	       	\\ \noalign{\smallskip}
\hline
\end{tabular}}
\smallskip 
$^{a}$ Corrected for recombination contribution to {\fnii}~$\lambda$5755 line (see text).\\
$^{b}$ Corrected for recombination contribution to {\foii}~$\lambda$$\lambda$7320+30 lines (see text).\\
$^{ c}$  {\ariv}~$\lambda$4740.17 line affected by charge transfer in the CCD.\\
$^{ d}$  {\sii}~$\lambda$$\Lambda$4068.60, 4076.35 lines corrected for the contributions of 
{\ciii}~$\lambda$4067.94 line and {\oii}~$\lambda$4075.86, respectively. 
\end{table}