\begin{table}%t3
\caption{Barred potential model parameters.}\label{tab:barmod}       
\small%\centerline
{
\begin{tabular}{l c c c c c c c }         
\hline\hline 
Galaxy position angle (deg) & 20 \\
Characteristic length (pc) & 400$^a$ \\
Characteristic velocity (km~s$^{-1}$) & 220$^a$ \\
Bar position angle (deg) & 20 \\
Bar strength & 0.015 \\
Pattern speed (km~s$^{-1}$~kpc$^{-1}$) & 60$^a$ \\
Radial dissipation rate (km~s$^{-1}$~pc$^{-1}$) & 0.002 \\
Azimuthal dissipation rate (km~s$^{-1}$~pc$^{-1}$) & 0.005 \\
\hline                  
Charact. radius (pc) & 10  & 250 & 400 & 600 & 700 & 1500 & 3000 \\
\hline  
Col. dens. (no units) & 1.5 & 0.1 & 0.5 & 1.0 & 0.05 & 0.02 & 0.02 \\
Velocity disp. (km~s$^{-1}$) & 35 & 10 & 30 & 30 & 10 & 10 & 10 \\
Scale height (pc) & 10 & 10 & 10 & 10 & 10 & 10 & 10\\
\hline                                    
\end{tabular}}
\medskip
$^a$ Value fixed by the elliptical orbit model solution (see Appendix A.4).
\end{table}