Table 7: Electron density indicators in NGC 40.
Ion Ioniz. Lines Observed $N_{{\rm e}}$

pot. (eV) used ratio (cm^-3)

[S II] 10.4 6731/6716 1.39 2100

13.6 3626/3729 1.3 1400

14.5 6584/122 140. 2000

23.3 33.5/18.7 0.76 1100

23.8 5538/5518 1.3: 4500

24.4 1907/1909 1.27 4000

35.1 52/88 1.7 800

**Table 7:** Electron density indicators in NGC 40.
Ion	Ioniz.	Lines	Observed	$N_{{\rm e}}$
	pot. (eV)	used	ratio	(cm^-3)
[S II]	10.4	6731/6716	1.39	2100
	13.6	3626/3729	1.3	1400
	14.5	6584/122	140.	2000
	23.3	33.5/18.7	0.76	1100
	23.8	5538/5518	1.3:	4500
	24.4	1907/1909	1.27	4000
	35.1	52/88	1.7	800

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