Table 2: HH1 jet: physical parameters.
      Diagnostics from O/S/N lines Diagnostics from Fe lines
Knot Da $A_{\rm V} \pm \Delta A_{\rm V}^{b}$ $n_{\rm e} \pm \Delta n_{\rm e}$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
  $\hbox{$^{\prime\prime}$ }$ mag 103 cm-3   103 cm-3 K 103 cm-3 K
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 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 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 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 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 2.0 $\pm$ 0.8 20 300 $\pm$ 2300 ... ...
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. 2004).

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Article Contents
1 Introduction
2 Observations and results
3 Derived physical parameters along the HH1 jet
4 Mass flux in the jet
5 Abundances of refractory elements
6 Summary
References
Online Material
Appendix A: diagnostic capabilities of the observed lines
Appendix B: determination of $A_{\rm V}$ from [Fe II] lines
List of tables
List of figures