\begin{table}%t1
\caption{Spectral slope values measured in this work compared to those already published.}
\label{tab:comp}
\par
\small%\centerline
 {
\begin{tabular}{lcc}
\hline \hline
&& \\[-8pt]
Object& $S$ (\% (0.1 $\mu$m)$^{-1}$)& $S$ (\% (0.1 $\mu$m)$^{-1}$)\\
      & this work                & from literature           \\
\hline
10~199 Chariklo         	 	&  7.8 $\pm$ 0.5 		&  7.8 $\pm$ 0.5$^a$\\
26~375 (1999 DE$_9$)    	 	& 22.2 $\pm$ 0.6 		& 25.5 $\pm$ 0.2$^b$\\
28~978 Ixion                	& 20.0 $\pm$ 0.8 		& 17.9 $\pm$ 0.4$^c$\\
                          	&              		& 22.2 $\pm$ 0.2$^d$\\
32~532 Thereus (2001 PT$_{13}$) 	& 12.0 $\pm$ 0.7 		& 11.1 $\pm$ 0.2$^b$\\
47~171 (1999 TC$_{36}$)      	& 37.3 $\pm$ 0.7  	& 30.6 $\pm$ 0.2$^b$\\
                          	&              		& 29$^e$\\
47~932 (2002 GN$_{171}$) 	& 21.8 $\pm$ 0.4$\dagger$ & 24.1 $\pm$ 0.2$^f$\\
                          	&              	  	& 16.2 $\pm$ 0.2$^g$\\
50~000 Quaoar      	 	& 28.5 $\pm$ 0.8 	 	& 26.9 $\pm$ 0.2$^f$\\
54~598 Bienor (2000 QC$_{243}$) 	&  8.7 $\pm$ 0.7 	 	& 10.1 $\pm$ 0.2$^b$\\
55~567 (2002 AW$_{197}$)	 	& 24.8 $\pm$ 0.7 	 	& 22.1 $\pm$ 0.2$^f$\\
60~558 Echeclus (2000 EC$_{98}$)	& 12.5 $\pm$ 0.7 	 	& 23.7 $\pm$ 0.7$^b$\\
83~982 Crantor (2002 GO$_9$)	& 39.1 $\pm$ 0.8$\dagger$ & 35.8 $\pm$ 0.1$^f$\\
145~453 (2005 RR$_{43}$)  	&  0.6 $\pm$ 0.7 	 	&  0.4 $\pm$ 1.0$^h$\\
2003 AZ$_{84}$		 	&  3.0 $\pm$ 0.6 	 	&  3.3 $\pm$ 0.2$^f$\\
\hline
\end{tabular}}
\medskip
$\dagger$ Weighted mean from values in Table~\ref{tab2}.
$^a$ Barucci et~al. (\cite{bar99}),
$^b$~Lazzarin et~al. (\cite{laz03}),
$^c$ Marchi et~al. (\cite{marchi03}),
$^d$ Boehnhardt et~al. (\cite{boeh04}),
$^e$ Merlin et~al. (\cite{mer05}),
$^f$ Fornasier et~al. (\cite{forna04b}),
$^g$ de Bergh et~al. (\cite{debergh04}),
$^h$ Pinilla-Alonso et~al. (\cite{noe07}).
\end{table}