\begin{table}%t5
\par
\caption{\label{tab:ne}Electron density along the HH46-47 jet.}
%\centerline
 {
    \begin{tabular}[h]{ccccc}
 \hline     \hline 
 \noalign{\smallskip}
Knot 
& $r_t$\tablefootmark{a} &
$n_{\rm e}\pm \bigtriangleup n_{\rm e}$\tablefootmark{b}  &
$n_{\rm e}$(HVC)\tablefootmark{c} &
$n_{\rm e}$(LVC)\tablefootmark{b}\\
 & (\arcsec) & (cm$^{-3}$) & (cm$^{-3}$)   &  (cm$^{-3}$) \\
\hline  \\[-3mm]
S    & (--3.4, +2.8)  & 6300$^{+1700}_{-1300}$ &	5400	&	7650	 \\ 
Z2   & (--9.3, --5)&  1300$^{+1800}_{-1200}$   &	2350	&	4600	\\ 
Z1   & (--14.8, --9.3)   & 3200$^{+700}_{-850}$  &	3100	&		\\[1mm]
\hline
\end{tabular}}
\tablefoot {\tablefoottext{a}{Distance from the source in arcsec. Negative values correspond to the southeastern, redshifted jet axis.}
\tablefoottext{b}{Electron density measured from the ratio \fe~1.60/1.64~\um.}
\tablefoottext{c}{Electron density measured from the ratio \fe~1.60/1.64~\um~ for the HVC and LVC.}}
\end{table}