\begin{table}%t3
\caption {\label{tab:Abundances}Assumed element abundances in (gas~+~ice)}
%\centerline
 {\begin{tabular}{ccc}
\hline\hline
Element & $12+\log\epsilon$ & Mass fraction $\hat\epsilon$\\
\hline 
%&&\\[-2.2ex]
H   &  12.00 & $7.66\times 10^{-1}$\\
He  &  10.88 & $2.28\times 10^{-1}$\\
C   &   8.11 & $1.19\times 10^{-3}$\\
N   &   7.33 & $2.28\times 10^{-4}$\\
O   &   8.46 & $3.52\times 10^{-3}$\\
Mg  &   6.62 & $7.76\times 10^{-5}$\\
Si  &   6.90 & $1.70\times 10^{-4}$\\
S   &   6.28 & $4.64\times 10^{-5}$\\
Fe  &   6.63 & $1.82\times 10^{-4}$\\
\hline 
\end{tabular}}
\par
\smallskip
This choice of element abundances implies $\rho=1.315{\rm~amu}\cdot\nH$.\\
\end{table}