\begin{table}%t2
%\centering
\par
\caption{\label{ews}Equivalent widths of the hydrogen recombination lines H$\beta$, H$\gamma$ and
H$\delta$ as measured directly in the spectra of the observed knots 
once the underlying stellar populations have been removed, with the corresponding correction factors.}
\begin{tabular}{c c c c c}
\hline
\hline
Knot  & A & B & C & D         \\
\hline
$EW$(H$\alpha$) (\AA) & $270\pm 30$ &  $130\pm 10$ & $40\pm 2$ & $140\pm 5$ \\
$f_{\rm c}$   &  1.00 & 1.00 & 1.05 & 1.00 \\
$EW$(H$\alpha$)$_{\rm c}$ (\AA) & $270\pm 30$ &  $130\pm 10$ & $42\pm 2$ & $140\pm 5$ \\
\hline
$EW$(H$\beta$) (\AA) & $34.9\pm 4.5$ &  $30.0\pm 1.7$ & $10.7\pm 1.1$ & $32.2\pm 4.7$ \\
$f_{\rm c}$   &  1.01 & 1.03 & 1.13 & 1.00 \\
$EW$(H$\beta$)$_{\rm c}$ (\AA) & $35.2\pm 4.7$ &  $30.9\pm 1.8$ & $12.1\pm 1.3$ & $32.2\pm 4.9$ \\
\hline
$EW$(H$\gamma$) (\AA) & $17.2\pm 1.7$ &  $12.8\pm 0.9$ & $5.0\pm 0.9$ & $10.8\pm 1.7$ \\
$f_{\rm c}$   &  1.03 & 1.03 & 1.19 & 1.00 \\
$EW$(H$\gamma$)$_{\rm c}$ (\AA) &  $17.7\pm 1.3$ &  $13.2\pm 1.0$ & $6.0\pm 1.0$ & $10.8\pm 0.9$ \\
\hline
$EW$(H$\delta$) (\AA) & $8.1\pm 0.6$ &  $6.2\pm 0.7$ & $1.8\pm 1.0$ & $8.0\pm 0.8$ \\
$f_{\rm c}$   &  1.09 & 1.13 & 1.24 & 1.03 \\
$EW$(H$\delta$)$_{\rm c}$ (\AA) & $8.8\pm0.6$ &  $7.0\pm 1.0$ &  $2.3\pm 1.0$ & $8.2\pm 1.0$ \\
\hline
\end{tabular}
\end{table}