**Table 3:** Proper motion computed for each knot within the jet.
$\Delta t$	Feature	displacement $\rm H_{\rm\alpha}$	displacement [SII]	v@150 pc $\rm H_{\rm\alpha}$	v@150 pc [SII]	v error	Comment
yr		arcsec	arcsec	km s^-1	km s^-1	km s^-1
1998-1996	D	0.24	0.28	80	94	34	center^a
1998-1996	D₂	0.35	0.46	119	156	34	center
1998-1996	E	0.38	0.46	128	156	34	center
1998-1996	F	0.39	0.28	131	95	34	max^b
1998-1996	F₂	0.75	0.93	252	316	34	max
2005-1996	D	1.34	1.54	106	123	8	center
2005-1996	D₂	-	-	-	-	-	disappeared in 2005
2005-1996	E	-	-	-	-	-	disappeared in 2005
2005-1996	F	0.24	0.74	19	59	8	max
2005-1996	F₂	0.76	1.19	60	94	8	max
^a Proper motion computed using the position of the center of the contour.
^b Proper motion computed using the position of the maximum within the contour.

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