\begin{table}%t3
\caption{Medium-resolution spectroscopy parameters.} \label{tab:hr}  
\small%\centerline
{
\begin{tabular}{cccc}
\hline \hline
Knot &  slit & $v-v_{\rm cloud}$$^a$  &  $\Delta v$   \\  
     &       &\multicolumn{2}{c} {(km s$^{-1}$)}  \\ 
\hline
C1   &   III   & --15           & 19 $\pm$ 5        \\  
B    &   III   & --12           & 13 $\pm$ 5         \\ 
A    &   III   & --12           & 16 $\pm$ 5         \\ 
C2   &   IV    & --14           & 12 $\pm$ 8         \\ 
L    &   IV    & --13           & 20 $\pm$ 6         \\ 
E    &   IV    & --12           & 13 $\pm$ 7         \\ 
K    &   IV    & --9            & 21 $\pm$ 8         \\ 
\hline
\end{tabular}}
\medskip
Note: $^a$  The estimated uncertainty is within 3~km~s$^{-1}$.
\end{table}