Table 6: Electron temperature indicators in M 1-42.
Ion Ioniz. Lines Observed $T_{\rm e}$
  Pot. (eV) Used Ratio (K)
[N II] 14.5 5755/6584 0.0108 8400
[S III] 23.3 6312/18.7 0.0079 7500
[Ar III] 27.6 7136/21.8 4.39 6500
[O III] 35.1 4363/5007 0.0050 9300
[O III] 35.1 5007/51.8 2.83 7800
[Ne III] 41.0 3869/15.5 0.136 7000


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