Table 1: Observed and dereddened line fluxes for the WHT+ISIS spectrum at ${\rm PA}= 125^{\circ }$ (normalized to H $\beta$ = 100). Percentage rms errors are given within brackets.
Line Ident. (Å) $\lambda$ (Obs.) Observed flux Dereddened flux

[O II] 3726.0, 3728.8 3726.8 62.7 (6.1) 274.1 (9.0)

[Ne III] 3868.7 3868.6 46.0 (6.0) 174.8 (8.5)

[Ne III] 3967.5 + H $\epsilon$ 3968.0 18.2 (12.4) 61.7 (13.5)

H $\gamma$ 4340.5 4339.9 25.3 (6.8) 51.8 (7.5)

He II 4685.7 4685.3 47.7 (4.0) 59.9 (4.1)

H $\beta$ 4861.3 4860.9 100.0 (2.5) 100.0 (2.5)

[O III] 4958.9 4958.4 194.8 (1.8) 173.2 (1.9)

[O III] 5006.8 5006.4 630.3 (1.6) 530.3 (1.7)

[N I] 5197.9, 5200.2 5198.6 17.3 (8.5) 11.8 (8.7)

He II 5411.6 5410.1 7.9 (18.4) 4.4 (18.6)

[N II] 5754.6 5753.6 37.5 (4.1) 16.1 (5.6)

He I 5875.7 5874.7 24.7 (6.5) 9.8 (7.7)

[O I] 6300.3 6298.9 43.5 (5.1) 13.1 (7.4)

[S III] 6312.1 6309.6 11.1 (21.2) 3.3 (21.9)

[O I] 6363.8 6362.3 14.1 (14.3) 4.1 (15.4)

[N II] 6548.0 6546.4 876.9 (1.5) 226.4 (6.3)

H $\alpha$ 6562.8 6561.0 1116.0 (1.4) 285.6 (6.3)

[N II] 6583.4 6581.7 2732.1 (1.4) 690.6 (6.4)

He I 6678.1 6676.7 13.8 (12.3) 3.3 (13.9)

[S II] 6716.5 6714.9 141.2 (2.1) 32.9 (6.9)

[S II] 6730.8 6729.2 127.4 (2.2) 29.5 (7.0)

He I 7065.3 7063.5 17.3 (8.5) 3.3 (11.4)

[Ar III] 7135.8 7134.0 74.7 (2.8) 13.5 (8.2)

[O II] 7319.4 7317.7 19.8 (10.3) 3.2 (13.2)

[O II] 7330.3 7328.3 18.6 (9.7) 3.0 (12.8)

He II 7592.7 7590.0 6.0 (26.2) 0.8 (27.7)

[Ar III] 7751.4 7749.2 24.8 (6.0) 3.1 (11.2)

He II 8236.8 8234.8 8.2 (16.4) 0.8 (19.6)

[S III] 9068.9 9066.4 288.3 (2.3) 19.0 (12.5)

P9 9229.0 9227.5 37.2 (10.9) 2.3 (16.6)

[S III] 9531.0 9528.5 524.0 (2.9) 29.9 (13.3)

P7 10049.4 10047.2 70.7 (28.5) 3.5 (31.6)

He II 10123.6 10121.6 221.1 (10.2) 10.8 (17.1)

**Table 1:** Observed and dereddened line fluxes for the WHT+ISIS spectrum at ${\rm PA}= 125^{\circ }$ (normalized to H $\beta$ = 100). Percentage rms errors are given within brackets.
Line Ident. (Å)	$\lambda$ (Obs.)	Observed flux	Dereddened flux
[O II] 3726.0, 3728.8	3726.8	62.7 (6.1)	274.1 (9.0)
[Ne III] 3868.7	3868.6	46.0 (6.0)	174.8 (8.5)
[Ne III] 3967.5 + H $\epsilon$	3968.0	18.2 (12.4)	61.7 (13.5)
H $\gamma$ 4340.5	4339.9	25.3 (6.8)	51.8 (7.5)
He II 4685.7	4685.3	47.7 (4.0)	59.9 (4.1)
H $\beta$ 4861.3	4860.9	100.0 (2.5)	100.0 (2.5)
[O III] 4958.9	4958.4	194.8 (1.8)	173.2 (1.9)
[O III] 5006.8	5006.4	630.3 (1.6)	530.3 (1.7)
[N I] 5197.9, 5200.2	5198.6	17.3 (8.5)	11.8 (8.7)
He II 5411.6	5410.1	7.9 (18.4)	4.4 (18.6)
[N II] 5754.6	5753.6	37.5 (4.1)	16.1 (5.6)
He I 5875.7	5874.7	24.7 (6.5)	9.8 (7.7)
[O I] 6300.3	6298.9	43.5 (5.1)	13.1 (7.4)
[S III] 6312.1	6309.6	11.1 (21.2)	3.3 (21.9)
[O I] 6363.8	6362.3	14.1 (14.3)	4.1 (15.4)
[N II] 6548.0	6546.4	876.9 (1.5)	226.4 (6.3)
H $\alpha$ 6562.8	6561.0	1116.0 (1.4)	285.6 (6.3)
[N II] 6583.4	6581.7	2732.1 (1.4)	690.6 (6.4)
He I 6678.1	6676.7	13.8 (12.3)	3.3 (13.9)
[S II] 6716.5	6714.9	141.2 (2.1)	32.9 (6.9)
[S II] 6730.8	6729.2	127.4 (2.2)	29.5 (7.0)
He I 7065.3	7063.5	17.3 (8.5)	3.3 (11.4)
[Ar III] 7135.8	7134.0	74.7 (2.8)	13.5 (8.2)
[O II] 7319.4	7317.7	19.8 (10.3)	3.2 (13.2)
[O II] 7330.3	7328.3	18.6 (9.7)	3.0 (12.8)
He II 7592.7	7590.0	6.0 (26.2)	0.8 (27.7)
[Ar III] 7751.4	7749.2	24.8 (6.0)	3.1 (11.2)
He II 8236.8	8234.8	8.2 (16.4)	0.8 (19.6)
[S III] 9068.9	9066.4	288.3 (2.3)	19.0 (12.5)
P9 9229.0	9227.5	37.2 (10.9)	2.3 (16.6)
[S III] 9531.0	9528.5	524.0 (2.9)	29.9 (13.3)
P7 10049.4	10047.2	70.7 (28.5)	3.5 (31.6)
He II 10123.6	10121.6	221.1 (10.2)	10.8 (17.1)

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