\begin{table}%t2
\caption{HH1 jet: physical parameters.}\label{tab2}
%\centerline
{
    \begin{tabular}{ccc|cccc|cc}
      \hline \hline
      &   & & \multicolumn{4}{c}{Diagnostics from O/S/N lines} & \multicolumn{2}{|c}{Diagnostics from Fe lines} \\
Knot  & $D^{a}$ &  $A_{\rm V} \pm \Delta A_{\rm V}^{b}$ & $n_{\rm e} \pm \Delta n_{\rm e}$$^{c}$ & $x_{\rm e} \pm \Delta x_{\rm e}$$^{c}$
 & $n_{\rm H} \pm \Delta n_{\rm H}$$^{c}$ & $T_{\rm e} \pm \Delta T_{\rm e}$$^{c}$ & $n_{\rm e} \pm \Delta n_{\rm e}$$^{c}$ & $T_{\rm e} \pm \Delta T_{\rm e}$$^{c}$\\
      & $\arcsec$ & mag  & 10$^{3}$ cm$^{-3}$  &  & 10$^{3}$ cm$^{-3}$ & K &  10$^{3}$ cm$^{-3}$ & K\\
\hline 
L--I & 1.2--3.8    &   8.3 $\pm$ 0.5  & 2.8 $\pm$ 0.1 & 0.02 $\pm$ 0.01 &  101.1 $\pm$ 40.6& 20~500 $\pm$ 1900 & 11 $\pm$ 1 & $\rm 11~000^{+4500}_{-1500}$\\
H  &  3.8--5.5   &    2.9 $\pm$ 0.5  & 2.6 $\pm$ 0.1 & 0.06 $\pm$ 0.01 &   45.4 $\pm$ 7.9 & 13~000 $\pm$ 1100 &  8 $\pm$ 1   & $\rm 9200^{+2000}_{-1000}$ \\
G  &  5.5--8.5   &    2.0 $\pm$ 0.5  &  2.1 $\pm$ 0.1 & 0.05 $\pm$ 0.01 &   38.1 $\pm$ 6.1 & 11~200 $\pm$ 900\phantom{1} &  5 $\pm$  1   & $\rm 10~500^{+3500}_{-1500}$\\
F  &  8.5--11    &    2.0 $\pm$ 0.5  & 1.2 $\pm$ 0.1 & 0.05 $\pm$ 0.01 &   26.4 $\pm$ 6.2 & 11~700 $\pm$ 1000 &  4 $\pm$ 1    & $\rm 9800^{+2500}_{-1500}$ \\
E  &  11--12.4   &    1.3 $\pm$ 0.5  & 0.9 $\pm$ 0.1 & 0.05 $\pm$ 0.01 &   17.7 $\pm$ 5.1 & 12~800 $\pm$ 1200 & 30  $\pm$  20 & $\rm 8200^{+1500}_{-1000}$ \\
D  &  12.4--13.8 &    1.3  $\pm$ 0.5  &  0.7 $\pm$ 0.1 & 0.08 $\pm$ 0.02 &     \phantom{1} 8.2 $\pm$ 3.2 & 13~200 $\pm$ 1400 & ... & $\rm 8300^{+1000}_{-1300}$ \\
C  &  13.8--15.6 &    1.3 $\pm$ 0.5 &    0.6 $\pm$ 0.1 & 0.15 $\pm$ 0.03 &      \phantom{1}4.1 $\pm$ 1.9 & 15~100 $\pm$ 2000 & ... & $\rm 9200^{+4500}_{-2500}$ \\
B  &  15.6--19.1 &    1.3 $\pm$  0.5  &  0.7 $\pm$ 0.1 & 0.13 $\pm$ 0.03 &      \phantom{1}5.4 $\pm$ 2.1 & 14~200 $\pm$ 1800 & ... &$\rm 8500^{+3500}_{-1500}$\\
A  &  19.1-26.2  &    1.3 $\pm$ 0.5  &  0.6 $\pm$ 0.1 & 0.28 $\pm$ 0.05 &   \phantom{1} 2.0 $\pm$ 0.8 & 20~300 $\pm$ 2300 & ... &...\\
\hline 
\end{tabular}}
\medskip
$^{a}$ Distance from VLA1 in arcsec. \\
$^{b}$ Visual extinction measured from the ratio [FeII]1.64/1.32~$\mu$m (see
Appendix~B for details). \\
$^{c}$ $n_{\rm H}$ is calculated as $x_{\rm e}$/$n_{\rm e}$. Errors are estimated using 
both flux uncertainties and error propagation from uncertainties in the 
$A_{\rm V}$~determination and in solar abundance values reported in literature
(Asplund et~al. \cite{Asplu04}). 
\end{table}