Table 9: Electron temperature indicators in NGC 40.
Ion Ioniz. Lines Observed $T_{{\rm e}}$
  pot. (eV) used ratio (K)
[N II] 14.5 5755/6584 0.0078 7500
  23.3 6312/18.7 0.0145 7800
  27.6 7136/8.99 0.488 7000
  35.1 4363/5007 0.0062 10 500
  35.1 5007/52 2.15 8000
  41.0 3868/15.5 0.295 8400


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