\begin{table}
\caption{\label{Table:Ratios}Physical parameters and abundances.}
\small%\centerline
 {
\begin{tabular}{lccccccc} 
\hline\hline  
 Parameter  &  knot~1   & knot~2 &  knot~3 & knot~4 & knot~5 & Nucleus & 
               Integrated \\ 
\hline   
&&&&&&& \\[-8pt]
$\log\left(\frac{\left[\mbox{\ion{O}{iii}}\right]\;\lambda5007}{\Hb}\right)$       & 
        $ 0.56\pm0.02$  & 
        $ 0.54\pm0.02$  & 
        $ 0.50\pm0.03$  &
        $ 0.25\pm0.03$  & 
        $ 0.52\pm0.04$  & 
        $ 0.37\pm0.05$  & 
        $ 0.50\pm0.02$  \\[2pt]
$\log\left(\frac{\left[\mbox{\ion{N}{ii}}\right]\;\lambda6584}{\Ha}\right)$       & 
        $-1.04\pm0.02$  & 
        $-1.00\pm0.02$  & 
        $-1.12\pm0.05$  &   
	$-0.97\pm0.05$  & 
        $-1.18\pm0.09$  & 
        $-0.94\pm0.08$  & 
        $-1.03\pm0.02$  \\[2pt]
$\log\left(\frac{\left[\mbox{\ion{S}{ii}}\right]\;\lambda\lambda6717,\;6731}{\Ha}\right)$    & 
        $-0.79\pm0.02$  & 
        $-0.73\pm0.02$  & 
        $-0.75\pm0.03$  &   
	$-0.59\pm0.04$  & 
        $-0.77\pm0.07$  & 
        $-0.46\pm0.06$  & 
        $-0.61\pm0.02$  \\
    &&&&&&& \\[-8pt]    
\hline
&&&&&&& \\[-8pt]
$N_{\rm e}$([\ion{S}{ii}]) (cm$^{-3}$)       & 
        190             & 
        ${\leq}100$      &   
        ${\leq}100$      &   
	108             &  
        ${\leq}100$       &  
        ${\leq}100$       & 
        ${\leq}100$       \\
$T_{\rm  e}$([\ion{O}{ii}]) (10$^{4}$ K)        & 
        $1.18\pm0.07$   & 
        $1.22\pm0.07$   & 
        ---             & 
	---             & 
        ---             &  
        ---             & 
        $1.67\pm0.30$   \\ 
$T_{\rm  e}$([\ion{O}{iii}]) ($10^{4}$ K)       & 
        $1.27\pm0.10 $  & 
        $1.33\pm0.10 $  & 
        ---             & 
	---             & 
        ---             &  
        ---             & 
        $1.96\pm0.42$   \\ 
$12+\log(O/H)$ -- ($T_{\rm e}$)         & 
        $8.09\pm0.06 $  & 
        $8.03\pm0.06 $  & 
        ---             & 
	---             & 
        ---             & 
        ---             & 
       $7.71\pm0.13$   \\
$12+\log(\rm  {O/H})$ -- ($N2$)                                             & 
        8.26            & 
        8.28            & 
        8.23            & 
	8.30            & 
        8.20            & 
        8.31            & 
        8.27            \\
$12+\log({\rm O/H})$ -- ($O3N2$)                                            & 
        8.22            & 
        8.24            & 
        8.21            & 
	8.34            & 
        8.19            & 
        8.31            & 
        8.24            \\
$12+\log({\rm S}^{+}/{\rm H}^{+})$                &
        $5.87\pm0.05$   & 
    	$5.90\pm0.05$   &
    	---             &
    	---             &
    	---             &
    	---             &
    	$5.80\pm0.10$   \\
$12+\log({\rm N}^+/{\rm H}^+)$         &
        $6.52\pm0.05$   &
	$6.59\pm0.05$   &
        ---             &
	---             &
	---             &
	---             &
	$6.26\pm0.11$   \\
$\log({\rm N/O})$             &
       $-1.29\pm0.10$   &
       $-1.18\pm0.10$   &
        ---             &
        ---             &
        ---             &
	---             &
       $-1.27\pm0.21$   \\
\hline
\end{tabular}}
\medskip
Notes: $T_{\rm e}$ ([\ion{O}{ii}]) derived from the relation: $T_{\rm e} {\rm ([\mbox{\ion{O}{ii}}])}=0.72$~$\times$ $T_{\rm  e} {\rm ([\mbox{\ion{O}{iii}}])} + 0.26$ found by \cite{Pilyugin2006};
$T_{\rm e}$ ([\ion{O}{iii}]): electron temperature measured from [\ion{O}{iii}]~$\lambda4363$;
$12+\log({\rm O/H})$~-- ($T_{\rm e}$): direct O/H~abundance derived from $T_{\rm e}$[\ion{O}{iii}];  $12+\log({\rm O/H})$~-- ($N2$): O/H derived from the $N2$~index  \citep{PettinPagel2004}; the associated uncertainty is ${\pm}0.38$;
$12+\log({\rm O/H})$~-- ($O3N2$): O/H derived from the $O3N2$~index \citep{PettinPagel2004}; the associated uncertainty is $\pm0.25$. 
\end{table}