\begin{table}%t1
\caption{Circular model parameters.}\label{tab:circmod}       
%\centering
\small                          
\begin{tabular}{l c c c c c c c}         
\hline\hline                  
 Radius (pc) & 1.0 &  170 & 340 &  560 & 800 & 1700 & 2800 \\
\hline                         
 Rotation vel. (km~s$^{-1}$) & 40.0 &  30.0 &  40.0 &  50. & 70.0 & 100.0 & 110.0 \\
 Radial vel. (km~s$^{-1}$) & 0.0 & 0.0 & 0.0 & $-$120.0&  0.0 & 0.0 & 0.0 \\
 Col. dens. (no units) & 6.0 &  1.0 &  0.5 & 4.0 &  0.4 &  0.4 & 0.4 \\
 Velocity disp. (km~s$^{-1}$) & 40.0 & 10.0 & 10.0 & 20.0 & 10.0 & 10.0 & 10.0 \\
 Scale height (pc) & 20.0 & 15.0 & 10.0 & 10.0 & 10.0 & 10.0 & 10.0 \\
\hline                                    
\end{tabular}
\end{table}