\begin{table}%t2
%\centering
\par
\caption {Observed line fluxes $F_\lambda$ of PNe  
in \sexa\ and \sexb, on a scale where $F$(\hb)~=~100.0, and after
correcting for atmospheric dispersion effects. ":'' indicates uncertain
values, and "$<$'' upper limits. Associated errors are described in the
text.  Some nebular quantities are also reported: \cbeta, the electron
density and temperatures $T_{\rm e}$(\oiii) and $T_{\rm e}$(\nii), and the
heliocentric radial velocity of three PNe where it was measured.
%As indicated in the text, total errors are estimated to be of 50$\%$
%for 1$<$F$<$5, 25$\%$ for $5< F<10$, 10$\%$ for $10< F<50$, 5$\%$
%for 50$<$F$<$100 and 3$\%$ or better for F$>$100.  In addition, errors
%due to the correction for the atmospheric refraction range from 40$\%$
%at 370 nm to less than 1$\%$ at 5000 nm)
\label{Tab_s_pn}}
{\begin{tabular}{lllllll} 
\hline\hline\noalign{\smallskip} 
Ion 		 & SexA-PN & SexB-PN1 & SexB-PN2 & SexB-PN3 & SexB-PN4 & SexB-PN5 \\ 
\noalign{\smallskip} 
\hline 
\noalign{\smallskip} 
\cbeta\		        & 0.10~$\pm$~0.01  & 0.10~$\pm$~0.02     	&0.02~$\pm$~0.02 	&0.13~$\pm$~0.01 	&0.17~$\pm$~0.03 	    &0.22~$\pm$~0.01 	\\ 
\hline 
$N_{\rm e}$(cm$^{-3}$)	& 2700~$\pm$~100   & --        		& --         	& --        	& --                 &-- \\ 
\hline  
$T_{\rm e}$(\oiii) (K)	& 22~300~$\pm$~1000 & 12~800~$\pm$~2000    	& 16~000~$\pm$~3000& 20~000~$\pm$~2000& 11~300~$\pm$~3000    & 12~800~$\pm$~1000  \\ 
$T_{\rm e}$(\nii) (K)	        & 13~400~$\pm$~500  &--        		& --         	& --        	& --                 & -- \\ 
\noalign{\smallskip} 
\hline 
\noalign{\smallskip} 
$V$ (km~s$^{-1}$)		&--& 310~$\pm$~15 &-- &--   &310~$\pm$~15 &310~$\pm$~15 \\ 
\par
\noalign{\smallskip} 
\hline 
\noalign{\smallskip} 
\par
372.7   \oii\     &  176.~$\pm$~70 &  18:     	&	--	   &--	    	    &--	       		& 21.~$\pm$~10	  \\  
383.5    H9       &  8.~$\pm$~4    &  --       	&	8.~$\pm$~6   & 11.~$\pm$~6	    &--	       		& --	  \\  
386.8   \neiii\   &  19.~$\pm$~6   &  38.~$\pm$~10  &	28.~$\pm$~7  & 55.~$\pm$~5	    &43.~$\pm$~7	       	& 93.~$\pm$~5	  \\   
388.9    \hei, H8 &  28.~$\pm$~5   &  16.~$\pm$~8   &	21.~$\pm$~6  & 32.~$\pm$~5	    &24.~$\pm$~5	       	& 16.~$\pm$~4	  \\   
396.7    \neiii, H7& 27.~$\pm$~3   &  29.~$\pm$~7   &	22.~$\pm$~7  & 29.~$\pm$~4	    &37.~$\pm$~5	       	& 46.~$\pm$~3	  \\  
410.1    \hd\     &  31.~$\pm$~2   &  25.~$\pm$~7   &	19.~$\pm$~6  & 26.~$\pm$~4	    &26.~$\pm$~7	       	& 23.~$\pm$~3	  \\  
434.0    \hg\     &  48.~$\pm$~2   &  48.~$\pm$~4   &	45.~$\pm$~4  & 51.~$\pm$~3	    &51.~$\pm$~	       	& 45.~$\pm$~1.6	  \\  
436.3    \oiii\   &  23.~$\pm$~2   &  8.~$\pm$~4    &	13.~$\pm$~4  & 16.~$\pm$~4	    &7.~$\pm$~5		& 11.~$\pm$~1.9	  \\  
447.1    \hei     &  1.3~$\pm$~1   &  5.~$\pm$~4    &	9.~$\pm$~3   & 4.~$\pm$~2	    &-	       		& 5.~$\pm$~2	  \\  
468.6    \heii    &  51.~$\pm$~2   &  $<$1    	&	$<$3       & $<$2	    &$<$1	       	& 6.~$\pm$~2	  \\  
471.2	\hei,\ariv&--	    	 &--	        &	--	   & 2.~$\pm$~1	    &--	       		& --	  \\ 
474.0	\ariv	 & --	    	 & --	        &	--	   & 3.~$\pm$~2	    &--	       		& --	  \\ 
486.1    \hb\     &  100.~$\pm$~1  &  100.~$\pm$~4  & 	100.~$\pm$~4 & 100.~$\pm$~1.5   &100.~$\pm$~5	       	& 100.~$\pm$~2	  \\  
495.9    \oiii\   &  206.~$\pm$~1  &  202.~$\pm$~3  &	190.~$\pm$~4 & 182.~$\pm$~1.6   &256.~$\pm$~3	       	& 316.~$\pm$~1.8	  \\  
500.7	\oiii\	 &  611.~$\pm$~1   &  590.~$\pm$~2  &	570.~$\pm$~3 & 474.~$\pm$~1     &798.~$\pm$~3	       	& 940.~$\pm$~1.5	  \\  
520.0	\ni\	 &  38.~$\pm$~1    & --	       	&	--	   &--	    	    &--	       		& --	  \\  
541.1	\heii\	 &  4.2~$\pm$~1    & --	       	&	--	   &--	    	    &--	       		& --	  \\  
575.5	\nii\	 &  24.~$\pm$~1    & --        	&	--	   &--	            &--       		& 	  \\  
587.6	\hei\    &  8.~$\pm$~1     & 16.~$\pm$~2    &	17.~$\pm$~5  &15.~$\pm$~1	    &15.~$\pm$~3	       	& 22.~$\pm$~2	  \\  
630.0	\oi\     &  71.~$\pm$~1    & 3.~$\pm$~2     &	3.~$\pm$~1   &--	    	    &--	       		& --	  \\  
636.3	\oi\     &  24.~$\pm$~1    & --	        &	--	   &--	            &--	       		&-	  \\  
654.8	\nii\    &  291.~$\pm$~1.  & --	        &	--	   &--	            &--	       		&--	  \\  
656.3	\ha\     &  306.~$\pm$~1.5 & 302.~$\pm$~2   &	290.~$\pm$~3 &312.~$\pm$~1.3    &321.~$\pm$~3	       	& 332.~$\pm$~1.3	  \\    
658.4	\nii\	 &  835.~$\pm$~1.8 & 2:       	&	7:	   &6.~$\pm$~1.8	    &4.~$\pm$~3 	       	& 12.~$\pm$~1.2	  \\    
667.8	\hei\    &  3.~$\pm$~1.6   & 3.~$\pm$~2     &	3.~$\pm$~1.5 &4.~$\pm$~1	    &--	       		& 3.~$\pm$~1.5	  \\       
671.7	\sii\	 &  5.~$\pm$~1.6   &--	        &	--	   &--	    	    &--	       		&--	  \\       
673.1	\sii\	 &  8.~$\pm$~1.5   &--	        &	--	   &--	    	    &--	       		&--	  \\       
706.5	\hei\	 &  4.~$\pm$~1.6   & 6.~$\pm$~3     &	--	   &10.~$\pm$~4	    &4.~$\pm$~2	        &3.~$\pm$~1.5	  \\       
713.5	\ariii\	 &  3.~$\pm$~3     &--	        &	--	   &3.~$\pm$~2	    &--	       		&--	  \\       
728.1	\hei\    &  2.~$\pm$~2     &--	        &	--	   &--	    	    &--	       		&--	  \\       
732.5    \oii\    & 28.~$\pm$~2    & 5.~$\pm$~3     &	7.~$\pm$~3   &--	    	    &11.~$\pm$~2	       	&--	  \\      
906.9    \siii\   &  7.~$\pm$~3    &--	        &	--	   &--	    	    &2.~$\pm$~2	       	&--	  \\      
953.2	\siii\   &  19.~$\pm$~2    &--	        &	--	   &5:	    	    &5:		       	&17:	  \\
\hline 
\end{tabular} 
} 
\end{table}