\begin{table}%T4 
\caption{\label{table4}Extinction coefficients.}
\small%\centering
\par
\begin{tabular}{lcccc}
\hline\hline\noalign{\smallskip}
Object 		& $c$({\hb}) 		& $E(B-V)$	& Lines used 			& {\te} (K), {\elecd} (cm$^{-3}$)	\\
\noalign{\smallskip} \hline  
PB~8		& $0.36\pm0.05$		& 0.24		& H16 to H3 and P22 to P11      &	6500, 4000		\\
NGC~2867--1 	& $0.39\pm0.03$ 	& 0.26		& H16 to H3 and P22 to P11	&	10~000, 2600		\\
NGC~2867--2 	& $0.43\pm0.04$ 	& 0.29		& H16 to H3 and P22 to P11	&	10~000, 2600		\\
PB~6--1		& $0.47\pm0.0$5		& 0.32		& H11 to H3 and P12 to P11  	&	14~000, 1700		\\
PB~6--2		& $0.53\pm0.03$		& 0.36		& H11 to H3 and P12 to P11  	&	14~000, 1700		\\
\hline 
\end{tabular}
\end{table}