\begin{table}%t2
\caption{Some disk parameters of the (candidate) nanodiamond
  sources. The Meeus group indicates the overall geometry of the
  disk. The ratio of the total IR~excess to the stellar luminosity,
  $L_{\rm exc}/L_\star$, indicates the fraction of stellar flux
  that is captured and reprocessed by the disk. For passive disks, this
  number represents the fraction of the sky covered by the disk, as
  seen from the central star. The ratio for T~CrA is
  likely overestimated due to strong nearby IR~emission, not directly
  linked to the system. The parameter~$n$ is the spectral index in the
  450~$\mu$m$-$1.3~mm range, defined by $\lambda F_\lambda \propto
  \lambda^{-n}$.}\label{diskpar}
\small%\centerline
{
\begin{tabular}{llccc}
\hline\hline
\# & Target  & Group & $L_{\rm exc}/L_\star$ & $n$ \\
\hline	                   	      	        
   & Elias~3$-$1    & I & 0.5$-$1.3$^a$ & 3.23 $\pm$ 0.03  \\
33 & HD~97048       & I & 0.40 & $>$2.9  \\
50 & MWC~297        & E & 0.06 & 3.1 $\pm$ 0.2  \\
\hline		           
47 & V921~Sco       & E & 0.11 & 4.1 $\pm$ 0.3  \\
49 & HD~163296      & II& 0.34 & 2.9 $\pm$ 0.1  \\
57 & T~CrA          &II?& 3.8  & ?  \\
\hline		        
   & Median & I & 0.50 & 3.9  \\
   & Median & II& 0.44 & 3.0  \\
   & Median & E & 0.63 & 4.1  \\
\hline
\end{tabular}}
\medskip
$^a$ For Elias~3$-$1 we used a stellar luminosity of 20--50~$L_\odot$ (see Table~\ref{stelpar}).
\end{table}