\begin{table}%t8
\caption{Mean colour gradients for the subtypes of ellipticals, respectively
$di$E and $bo$E. The $un$E are always intermediate. The S0 NGC~5866 was rejected. 
\label{tab8}}
%\centerline
{\begin{tabular}{lllll}
\hline \hline 
 Subtype&Grad. & $N$  & Mean & Sigma  \\ 
 \hline
$di$E&$\Delta_{UB}$& 12& $-0.167\pm .012$& .042 \\
$bo$E&$\Delta_{UB}$& 13& $-0.144\pm .007$& .025 \\
$di$E&$\Delta_{BV}$& 20& $-0.072\pm .004$& .020 \\
$bo$E&$\Delta_{BV}$& 14& $-0.057\pm .004$& .015 \\
$di$E&$\Delta_{BR}$& 12& $-0.089\pm .008$& .028 \\
$bo$E&$\Delta_{BR}$& 13& $-0.072\pm .005$& .019 \\
$di$E&$\Delta_{VI}$& 17& $-0.081\pm .010$& .041 \\
$bo$E&$\Delta_{VI}$& 13& $-0.038\pm .005$& .019 \\
$di$E&$\Delta_{VJ}$& 19& $-0.166\pm .023$& .100 \\
$bo$E&$\Delta_{VJ}$& 14& $-0.105\pm .017$& .064 \\
$di$E&$\Delta_{VK}$& 19& $-0.262\pm .028$& .121 \\
$bo$E&$\Delta_{VK}$& 14& $-0.187\pm .022$& .081 \\
$di$E&$\Delta_{JK}$& 20& $-0.104\pm .007$& .031 \\
$bo$E&$\Delta_{JK}$& 14& $-0.076\pm .007$& .028 \\
\hline
\end{tabular}}
\par
\smallskip
(1) Subtype; (2) gradient; 
(3) number of cases; (4) mean; (5) standard deviation.
\end{table}