\begin{table}%t1
\caption{\label{t2}Grain porosity and fractional amount of carbon in grains
as derived from fitting the 10~$\mkm$ silicate emission feature.
}    \small%\centerline
{
 \begin{tabular}{lcccccccl}
\hline\hline
\noalign{\smallskip}
 Star & Type$^1$ & ${\cal P}$ &
 $V_{\rm Be1}/V_{\rm solid}$ & $M_{\rm Be1}/M_{\rm MgFeSiO_4}$ &
Age, Myr & Ref.$^2$ & Comment \\
\noalign{\smallskip}\hline
Tr 37 73-758     &  t  & 0.784      &  0.259    &  0.196     &    1.8  &  1  &                    \\
Tr 37 11-2146    &  t  & 0.705      &  0.217    &  0.156     &    0.9  &  1  &                    \\
Tr 37 11-2037    &  t  & 0.615      &  0.232    &  0.170     &    2.5  &  1  &                    \\
Tr 37 11-2031    &  t  & 0.542      &  0.167    &  0.113     &    2.5  &  1  &                    \\
Tr 37 14-183     &  t  & 0.704      &  0.281    &  0.219     &    0.9  &  1  &                    \\
Tr 37 82-272     &  t  & 0.726      &  0.188    &  0.130     &   10.5  &  1  &                    \\
Tr 37 12-2113    &  t  & 0.650      &  0.186    &  0.128     &    1.1  &  1  &                    \\
Tr 37 13-157     &  t  & 0.804      &  0.250    &  0.187     &    2.4  &  1  &                    \\
Tr 37 91-155     &  t  & 0.976      &  0.320    &  0.264     &    1.7  &  1  &                    \\
Tr 37 54-1547    &  t  & 0.556      &  0.132    &  0.085     &    5.7  &  1  &                    \\
Tr 37 13-1250    &  t  & 0.649      &  0.124    &  0.079     &    3.3  &  1  &                    \\
Tr 37 23-162     &  t  & 0.722      &  0.247    &  0.184     &    6.6  &  1  &                    \\
Tr 37 01-580     &  t  & 0.604      &  0.167    &  0.112     &    8.7  &  1  &                    \\
NGC 7160 DG-481  &  h  & 0.852      &  0.333    &  0.279     &   12.0  &  1  &                    \\
SU Aur           &  t  & 0.731      &  0.131    &  0.085     &    3.9  &  2  &  age from (5)           \\
GW Ori           &  t  & 0.562      &  0.102    &  0.064     &    1.0  &  2  &                    \\
CR Cha           &  t  & 0.471      &  0.107    &  0.067     &    1.0  &  2  &                    \\
Glass I          &  t  & 0.671      &  0.208    &  0.147     &    1.0  &  2  &                    \\
WW Cha           &  t  & 0.539      &  0.194    &  0.135     &    0.3  &  2  &                    \\
SZ 82            &  t  & 0.427      &  0.376    &  0.338     &    1.1  &  2  &                    \\
AS 205S          &  t  & 0.556      &  0.251    &  0.188     &    0.1  &  2  &                    \\
Haro 1-16        &  t  & 0.425      &  0.141    &  0.092     &    0.5  &  2  &                    \\
AK Sco           &  t  & 0.519      &  0.116    &  0.073     &    7.6  &  2  &  age from (5)           \\
FM Tau           &  t  & 0.598      &  0.256    &  0.193     &    2.8  &  3  &  age from (6)           \\
GG Tau A         &  t  & 0.401      &  0.356    &  0.310     &    3.3  &  3  &  age from (7)           \\
GG Tau B         &  t  & 0.841      &  0.342    &  0.292     &    1.6  &  3  &  age from (7)           \\
GM Aur           &  t  & 0.700      &  0.162    &  0.109     &    7.4  &  3  &  age from (7)           \\
IP Tau           &  t  & 0.493      &  0.213    &  0.152     &    4.3  &  3  &  age from (7)           \\
TW Hya           &  t  & 0.756      &  0.158    &  0.105     &   10.0  &  3  &  age from (2)           \\
Hen 3-600 A      &  t  & 0.860      &  0.239    &  0.176     &         &  3  &                    \\
V410 Anon 13     &  t  & 0.651      &  0.398    &  0.370     &         &  3  &                    \\
HD 104237        &  h  & 0.612      &  0.307    &  0.249     &    4.8  &  4  &  age from (5)           \\
HD 142527        &  h  & 0.673      &  0.301    &  0.242     &    1.0  &  4  &                    \\
HD 142666        &  h  & 0.680      &  0.268    &  0.205     &    4.4  &  4  &  age from (5)           \\
HD 144432        &  h  & 0.440      &  0.123    &  0.078     &    6.65 &  4  &  age from (5)           \\
HD 144668        &  h  & 0.832      &  0.504    &  0.569     &    0.5  &  4  &                    \\
HD 150193        &  h  & 0.398      &  0.180    &  0.124     &    2.6  &  4  &  age from (5)           \\
HD 163296        &  h  & 0.537      &  0.209    &  0.148     &    6.0  &  4  &  age from (5)           \\
HD 179218        &  h  & 0.948      &  0.292    &  0.231     &    1.3  &  4  &                    \\
HD 245185        &  h  & 0.704      &  0.149    &  0.098     &    3.3  &  4  &  age from (5)           \\
HD 36112         &  h  & 0.431      &  0.122    &  0.078     &    4.4  &  4  &  age from (5)           \\
HD 37357         &  h  & 0.480      &  0.206    &  0.146     &   10.0  &  4  &                    \\
HD 37806         &  h  & 0.732      &  0.405    &  0.382     &    0.8  &  4  &                    \\
AB Aur           &  h  & 0.714      &  0.187    &  0.129     &    4.8  &  4  &  age from (7)           \\
HK Ori           &  h  & 0.551      &  0.400    &  0.374     &    5.8  &  4  &  age from (5)           \\
UX Ori           &  h  & 0.392      &  0.160    &  0.107     &    2.8  &  4  &  age from (5)           \\
V380 Ori         &  h  & 0.694      &  0.493    &  0.545     &    7.4  &  4  &  age from (5)           \\
 \hline
\end{tabular}}
\smallskip
 $^1$ Meaning of symbols: t = T Tau star, h = Herbig Ae/Be star. \\
 $^2$ References for observational data: (1) Sicilia-Aguilar et~al.~(\cite{aurore07});
(2) Schegerer et~al.~(\cite{schetal06}); (3) Sargent et~al.~(\cite{sar06}); \\
   (4) van Boekel et~al.~(\cite{vb05});
(5) Blondel \& Tjin A Djie~(\cite{blo06}); (6) G\"udel et~al.~(\cite{gu06});
(7) Bertout et~al.~(\cite{ber07}).
\end{table}