\begin{table}%t6
\caption{Outflow properties of HzRGs.}\label{tab:outflow}
\par
\small%\centerline
 {
\begin{tabular}{lcccccc}
\hline \hline
Source & $D_{\rm opt}$ & $\Delta v$ & $\tau_{\rm opt}$ & $\dot{E}_{\rm kin,obs}$ & $\dot{E}_{\rm kin,ext}$ & $\dot{E}_{\rm shell}$\\
 (1)  & (2)         & (3)            & (4)& (5) & (6) & (7) \\
\hline
MRC0316-257 & 21 $\times$ 9 & 670 & 3.1&      &     & 44.4 \\
MRC0406-244 & 30 $\times$ 9 & 960 & 2.9& 45.3 &45.6 & 45.0 \\
TXS0828+193 & 28 $\times$ 10& 800 & 4.1& 45.3 &45.3 & 45.0 \\
\hline
MRC1138-262 & 53 $\times$ 32& 800 & 1  & 44.2 &     & 45.6 \\
\hline
\end{tabular}}
\medskip
For comparison we add MRC1138-262 from \citet{nesvadba06}. Column (1) -- source name. 
Column (2) -- extent of the optical line emission in kpc along the major and minor axis, respectively. Column (3) -- velocity offset between the blue and redshifted bubble in km~s$^{-1}$ in the rest-frame. Column (4) -- age of the outflow for constant~$\Delta v$ and neglecting projection effects in $10^7$~yrs. Column (5) -- energy injection necessary to power the outflow in erg~s$^{-1}$ (``method~1'', see Sect.~\ref{ssec:kinenergy} for details), and mass estimates based on the measured H$\alpha$~fluxes, uncorrected for extinction. This serves as a strict lower limit to the kinetic energy injection. Column (6) -- the same as Col.~(5), but using extinction-corrected H$\alpha$~fluxes. Column (7) -- energy injection necessary to inflate a hot bubble in erg~s$^{-1}$ (``method~2'', see Sect.~\ref{ssec:kinenergy} for details).
\end{table}