\begin{table}%t3
\caption{\label{mean}Mean spectral slope values and standand deviation of TNOs and Centaurs.}
\small%\centering
\par
\begin{tabular}{lcc}
 \hline\hline
Class & Mean & Std deviation \\ 
      & [\%/ (10$^3$~\AA)] & [\%/ (10$^3$~\AA)] \\ \hline
Centaurs & 20.5 & 15.1  \\
Classicals & 13.8 & 12.1\\
Resonants  & 20.8 & 15.6\\
SDOs \& Detached  & 21.1 & 18.3  \\
all TNOs \& Centaurs & 17.9 & 14.8 \\ 
\hline
\end{tabular} 
\end{table}