\begin{table}%T6
%%\centering
\par
\caption{Nucleus radius from IR and radio observations of Chiron.}
\label{radius_estimate}
$$
\begin{array}{p{2cm}p{3.5cm}cr@{~\pm~}l}
\hline\hline
\noalign{\smallskip}
Date$^{{a}}$      &Reference      &\lambda &\multicolumn{2}{c}{{\rm Radius}^{{b}}}\\
                &               &\rm [\mu m]  &\multicolumn{2}{c}{\rm [km]}\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
09 Jan. 1983     &Lebofsky et al. (\cite{Lebofsky1984})  &22.5  &97&30\\
18 Nov. 1991     &Campins et al. (\cite{Campins1994})    &19.2  &79&15\\
22 Nov. 1993     &Campins et al. (\cite{Campins1994})    &10.8  &102&14\\
                &Campins et al. (\cite{Campins1994})    &19.2  &114&12\\
31 Mar. 1994     &Campins et al. (\cite{Campins1994})    &10.6  &112&9\\
                &Campins et al. (\cite{Campins1994})    &20.0  &98&16\\
21 Jun. 2000     &Fernandez et al. (\cite{Fernandez2002})&12.5  &87&6\\
                &Fernandez et al. (\cite{Fernandez2002})&12.5  &98&8\\
23 Jun. 2000     &Fernandez et al. (\cite{Fernandez2002})&12.5  &87&6\\
                &Fernandez et al. (\cite{Fernandez2002})&17.9  &62&12\\
                &Fernandez et al. (\cite{Fernandez2002})&17.9  &70&11\\
&&&\multicolumn{2}{c}{}\\
16 Sep. 1983     &Sykes \& Walker (\cite{Sykes1991})    &25    &\multicolumn{2}{c}{{<}164}\\
                &Sykes \& Walker (\cite{Sykes1991})    &60    &\multicolumn{2}{c}{{<}127}\\
Jun. 1996        &This work                              &25  &71&6\\
                &This work                              &60  &75&12\\
                &This work                              &100  &67&14\\
&&&\multicolumn{2}{c}{}\\
22 Mar. 1991     &Jewitt \& Luu (\cite{Jewitt1992})             &800  &\multicolumn{2}{c}{{<}138}\\
27 Apr. 1994     &Altenhoff \& Stumpff (\cite{Altenhoff1995})   &1200  &74&9\\
\noalign{\smallskip}
\hline
\end{array}  
$$
$^{{a}}$~See Table~\ref{IR_radio_flux} for observation conditions. $^{{b}}$~Radius derived from the mixed model (MM) with a thermal inertia $I=3$~J~K$^{-1}$~m$^{-2}$~s$^{-1/2}$.
\end{table}