Table 5: Electron density indicators in M 1-42.
Ion Ioniz. Lines Observed $N_{\rm e}$

Pot. (eV) Used Ratio (cm^-3)

[S II] 10.4 6731/6716 1.25 1200

[O II] 13.6 3626/3729 1.44 1600

[S III] 23.3 33.5/18.7 0.65 1400

[Cl III] 23.8 5538/5518 0.924 1400

[O III] 35.1 51.9/88.4 2.13 800

**Table 5:** Electron density indicators in M 1-42.
Ion	Ioniz.	Lines	Observed	$N_{\rm e}$
	Pot. (eV)	Used	Ratio	(cm^-3)
[S II]	10.4	6731/6716	1.25	1200
[O II]	13.6	3626/3729	1.44	1600
[S III]	23.3	33.5/18.7	0.65	1400
[Cl III]	23.8	5538/5518	0.924	1400
[O III]	35.1	51.9/88.4	2.13	800

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