\begin{table}%t5
\caption{\label{grains}Grain properties in the disks$^1$.}  
%\centerline
 {\small 
\begin{tabular}{lll}
\hline\hline 
Name & Midplane & Surface \\
 & grains & grains  \\
\hline 
MWC~137  & SM  $a_{\max}=1$~cm    & SM $a_{\max}=1~\mu$m  \\
R~Mon    & SM  $a_{\max}=1$~cm    & 86\% graphite $^{100\%}_{50\%}$  $a_{\max}=1~\mu$m\\
MWC~1080 & SM  $a_{\max}=1$~cm    & SM $a_{\max}=100~\mu$m  \\
MWC~297  & SM  $a_{\max}=1$~cm    & SM $a_{\max}=1~\mu$m  \\
LKHa~215 & SM  $a_{\max}=1$~cm    & SM $a_{\max}=100~\mu$m  \\
Z~CMa    & SM  $a_{\max}=1$~cm   & 60\% graphite$^{100\%}_{50\%}$ $a_{\max}=1~\mu$m  \\
\hline
\end{tabular}}
\medskip
$^1$~The index of the power-law grain-size distribution is fixed ($p=3.5$). As a first step, we assumed the standard mixture (SM: 86\% silicates/14\% graphite) in the midplane and surface layers in all the sources. In the cases of R~Mon and Z~CMa, we needed to change the dust composition in the surface to fit the~SED. The range of allowed values are indicated (small figures) in the Table. See Sect.~5.7 for a detailed discussion of the uncertainties.
\end{table}