Table 1: Information about the 1996, 1998, and 2005 data in both filters.
Obs. ID Date Exposure time Filter

(s)

u31f0107t 1996 Feb. 03 1300 [SII]

u31f0108t 1996 Feb. 03 1200 [SII]

u31f0109t 1996 Feb. 03 1300 H $_{\rm\alpha }$

u31f010at 1996 Feb. 03 1200 H $_{\rm\alpha }$

u3nj0101r 1998 Mar. 15 1300 [SII]

u3nj0102r 1998 Mar. 15 1300 [SII]

u3nj0103r 1998 Mar. 15 1300 H $_{\rm\alpha }$

u3nj0104r 1998 Mar. 15 1300 H $_{\rm\alpha }$

u9570201m 2005 Jan. 22 1200 [SII]

u9570202m 2005 Jan. 22 1200 [SII]

u9570101m 2005 Jan. 21 1200 H $_{\rm\alpha }$

u9570102m 2005 Jan. 21 1200 H $_{\rm\alpha }$

**Table 1:** Information about the 1996, 1998, and 2005 data in both filters.
Obs. ID	Date	Exposure time	Filter
		(s)
u31f0107t	1996 Feb. 03	1300	[SII]
u31f0108t	1996 Feb. 03	1200	[SII]
u31f0109t	1996 Feb. 03	1300	H $_{\rm\alpha }$
u31f010at	1996 Feb. 03	1200	H $_{\rm\alpha }$
u3nj0101r	1998 Mar. 15	1300	[SII]
u3nj0102r	1998 Mar. 15	1300	[SII]
u3nj0103r	1998 Mar. 15	1300	H $_{\rm\alpha }$
u3nj0104r	1998 Mar. 15	1300	H $_{\rm\alpha }$
u9570201m	2005 Jan. 22	1200	[SII]
u9570202m	2005 Jan. 22	1200	[SII]
u9570101m	2005 Jan. 21	1200	H $_{\rm\alpha }$
u9570102m	2005 Jan. 21	1200	H $_{\rm\alpha }$

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