\begin{table}%t4
\caption{\label{discussion:tab}Estimated kinetic energy lost and variations in radiated energy
 for individual knots in HH~52 and HH~54.}
\small%\centerline
 {
\begin{tabular}{cccccc}
\hline \hline
knot     &  $\Delta K$ & $\Delta E_{\rm rad}({\rm HI})$ &  $\Delta E_{\rm rad}({\rm SII})$ & $\Delta E_{\rm rad}(\rm H_2)$ & $\Delta E_{\rm rad}(\rm tot)$ \\
  ID     &   (10$^{38}$ erg) &   (10$^{38}$ erg) &   (10$^{38}$ erg) &   (10$^{38}$ erg) &   (10$^{38}$ erg) \\
\hline
HH~52~B1   &  70       & 1.1  & 0.08  & 0.2--0.4  &  1.3--1.5 \\
HH~52~C1   &  17       & 0.8  & 0.18  & 0.4  &  1.3 \\
HH~52~C2   &  3.5      & 0.35  & 0.1  & --  &  0.4 \\
HH~54~H1   &  8.8      & 2.9  & 0.2    &  --       &  3.0     \\
HH~54~H2   &  9.6      & 2.8  & 0.12   &  0.9     &  3.8     \\
HH~54~H3   &  57       & 2.7  & 0.2    &  2     &  4.8     \\
HH~54~G    &  --18$^a$  & 4.0  & 0.02   & --  & 4.0  \\
HH~54~G0   &  26       & 0.8  & $<$0.01  & --  & 0.8  \\
\hline
\end{tabular}}
\medskip
Notes: $^{a}$ here the kinetic energy is increased from the interaction with~G0.
\end{table}