Table 6: The excitation index, defined as the ratio of [SII] to H $_{\rm\alpha }$ flux (Raga et al. 1996), for the knots within the HH 154 jet for the three epochs, 1996, 1998, and 2005.
Feature Year [SII]/H $_{\rm\alpha}^{*}$ Accuracy
      $(\%)$
D 1996 1.15 7.9
  1998 1.27 8.8
  2005 1.57 9.2
D2 1996 1.06 13.9
  1998 0.40 14.3
  2005 - -
E 1996 0.22 21.5
  1998 0.15 22.3
  2005 - -
F 1996 0.89 9.1
  1998 - -
  2005 - -
F2 1996 1.17 16.5
  1998 - -
  2005 - -
F+F2 1996 (0.90)  
  1998 (1.00)  
  2005 (0.94)  
* The values in brackets are the sum of the values
measured in single knots.

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