**Table 1:** Journal of the observations.
	$\lambda_{\rm C}$	$\Delta\lambda$		Exp. times^a
Filter	(Å)	(Å)	Date (UT)	(No. of frames^b)
H $\alpha +[$ N II]	6560	75	09,12-13/08/2002	12 000 (5)
[S II]	6708	20	09-10,12-13/08/2002	12 000 (5)
[O III]	5005	28	11/08/2002, 20/06/2004	9600 (4)

^a Total exposure times in s.
^b Number of individual frames.

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