\begin{table}%t6
%\centering
\par
   \caption{\label{clump_table}Properties for the eastern and western clumps around ${\rm cD_1}$
respectively ${\rm cD_2}$.}
  % \scriptsize
   \begin{tabular}{l|lll}
   \hline 
   \hline 
   %\noalign%{\smallskip}
    Clump & $\langle z\rangle$ & $\langle v\rangle\; [{\rm km\;s^{-1}}]$ & 
   $\sigma_{\rm v}\;[{\rm km\;s^{-1}}]$\\
   %\noalign%{\smallskip}
   \hline 
   %\noalign%{\smallskip}
   ${\rm cD_1}$ & $0.1685\pm0.0029$ & 50521 & 879\\
   ${\rm cD_2}$ & $0.1624\pm0.0032$ & 48697 & 960\\
   %\noalign%{\smallskip}
   \hline 
   \end{tabular}
   %\small
\end{table}