\begin{table}%t3
\par
\caption{\label{tab3}The mean spectral slope estimates. }
%\centerline
 {\begin{tabular}{ccc}
\hline
\hline
Name & $\bar{\Gamma}_{\rm obs}(\sigma_{\bar{\Gamma}_{\rm obs}})$ 
& $\bar{\Gamma}_{\rm 20\%}(\sigma_{\bar{\Gamma}_{\rm 20\%}})$  \\
\hline
Fairall 9    		& 1.82(0.16) & 2.01(0.08)  \\ 
PG~0804+761  		& 2.03(0.19) & 2.31(0.09)   \\ 	   
NGC~3227     		& 1.61(0.25) & 1.79(0.05)   \\ 	      
NGC~3516     		& 1.49(0.20) & 1.74(0.07)   \\ 	   
NGC~3783     		& 1.66(0.09) & 1.77(0.03)  \\ 	   
NGC~4051     		& 1.90(0.32) & 2.16(0.08)   \\ 	   
NGC~4151$^{a}$     	& 1.61(0.08) & 1.72(0.08)  \\      
Mrk~766      		& 2.06(0.16) & 2.25(0.06)   \\ 	   
NGC~4258$^{b}$     	& 1.69(0.16) & 1.80(0.20)  \\      
NGC~4395$^{c}$     	& 1.46(0.05) &  $-$ \\	 
MCG~-6-30-15 		& 1.86(0.14) & 2.03(0.06)   \\		
NGC~5506     		& 1.85(0.06) & 1.94(0.04)   \\		
NGC~5548     		& 1.75(0.10) & 1.87(0.06)   \\		
Ark~564      		& 2.51(0.22) & 2.82(0.16)   \\		
\hline 
\end{tabular}}
\par
\smallskip
Values in the parentheses correspond to the standard deviation of the
points about their mean. 
$^{a}$ Values estimated using the results of de Rosa \etal\
(\cite{deRosa07});
 $^{b}$ Values estimated using the results of  Fruscione \etal\
(\cite{Fruscione05}); 
$^{c}$ Estimate taken from Shih \etal\ (\cite{Shih03}).
\end{table}