\begin{table}%t3
%\centering
\par
\caption{Best-fitting parameters for the rays of Mz~3. ":'' means \mbox{uncertain}.\label{T3} } 
\begin{tabular}{c c c} 
\hline\hline
Parameter & Value & Range\\ 
\noalign{\smallskip} 
\hline  
Southern cone \\ 
\hline 
\noalign{\smallskip} 
$tD^{-1} \ \rm(year\ kpc^{-1})$ & $1600$ & $(1400{-}1800)$\\ 
$v_{\rm max} \ \rm (km \ s^{-1})$ & $220$ & $(190{-}240)$\\ 
$\theta \ (^\circ)$ & $47$ & $(46{-}48)$\\ 
$i \ (^\circ)$ & $71$ & $(68{-}74)$\\ 
\noalign{\smallskip} 
\hline 
Northern cone \\ 
\hline 
\noalign{\smallskip} 
$tD^{-1} \ \rm  (year\ kpc^{-1})$ & $1000$: & \\ 
$v_{\rm max} \ \rm (km \ s^{-1})$ & $280$: & \\ 
$\theta \ (^\circ)$ & $47$:  & \\ 
$i \ (^\circ)$ & $74$:  & \\ 
\hline 
\end{tabular} 
\end{table}