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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