\begin{table}%t1
%\centering
\par
\caption{Initial parameters for the reference gas drag runs.\label{param} }  
\begin{tabular}{ll}  
\hline  \hline  
Number of bodies & 2500\\  
Physical radius of bodies & variable (see graphs)\\  
Initial semi-major axis & 0.3--5~AU\\  
Initial eccentricities & $0<e<10^{-3}$\\  
Initial inclinations & $0<i<5.10^{-4}$~rd\\  
Gas density at 2 AU & $\rho_{\rm g0}=2\times 10^{-9}$~g~cm$^{-3}$\\  
Gas density radial profile & $\rho_{\rm g}\propto~r^{-2.75}$\\  
\hline  
\end{tabular}  
\end{table}