\begin{table}%t4
%\centering
\par
\caption{Doppler shifts and line widths (\kms) of SUMER region S4 and CDS region C6.}
\begin{tabular}{lcccccc}
\hline\hline
Region velocities& \multicolumn{3}{c}{Whole region}&\multicolumn{3}{c}{\hspace*{-3mm}Wing enhancement}\\
(\kms) & {\it t1} & {\it t2} & {\it t3} & {\it t1} & {\it t2} & {\it t3} \\
\hline
S4 (Doppler shifts)& 8.8 & 7.5 & 9.1 & $\times$ & $\times$ & $\times$ \\
S4 (Line widths)& 22.0 & 25.7 & 22.9 & $\times$ & $\times$ & $\times$ \\
C6 (Doppler shifts) & 9.7 & 12.6 & 9.2 & $\times$ & $\times$ & $\times$ \\ 
C6 (Line widths)& 33.8 & 32.9 & 32.0 & $\times$ & $\times$ & $\times$ \\
\hline
\end{tabular}
\label{ee_vels}
\end{table}