\begin{table}%t1
\caption{\label{table:1}The projected kinetic energy estimates of gas ejections.}             
%\centerline
{                       
\begin{tabular}{l c c c c}        
\hline\hline \noalign{\smallskip}               
Source & $D^{\rm a}$  & $M^{\rm b}$          & $V^{\rm c}$           & $E_{\rm kin}$ \\    % table heading 
       & (pc)         & ($M_{\odot}$)         & (km s$^{-1}$)         & ($\times10^{49}$~erg) \\
\hline \noalign{\smallskip}                        % inserts single horizontal line
G43.224--0.038    &  12.6  &  $2.6\times10^3$  &  $21.7\pm4.9$  &  $1.2\pm0.6 $ \\     
G43.24--0.05      &  15.6  &  $1.6\times10^4$  &  $26.8\pm6.0$  & $11.4\pm5.6 $ \\     
\hline 
W49A Southwest   &   6.2  &  $3.5\times10^4$  &  $10.7\pm2.4$  & $4.0\pm2.0 $ \\    
OH43.13+0.04     &  12.2  &  $8.0\times10^3$  &  $21.0\pm4.7$  & $3.5\pm1.7 $ \\    
G43.108+0.044    &  15.9  &  $1.9\times10^3$  &  $27.4\pm6.1$  & $1.4\pm0.7 $ \\    
G43.009+0.050    &  18.0  &  $2.0\times10^3$  &  $31.0\pm6.9$  & $1.9\pm0.9 $ \\    
\hline                                  
\end{tabular}}
\tablefoot{\tablefoottext{a}{The distance to the shell expansion center without a projection correction.}
\tablefoottext{b}{The gas mass of clumps adopted from \citet{Matthews2009}.}
\tablefoottext{c}{The ejection velocity of clumps assuming a constant ejection velocity in $5.7\times10^5$ yr.}}\vspace*{3mm}
\end{table}