Table 1: Electron temperature indicators and symbols.
Spectroscopic index Temperature symbols
$(I_{\lambda} (3646^-) - I_{\lambda} (3646^+))$/H$\beta$ $T_{\rm e}$(Bac)
[O III $(\lambda 4959 + \lambda 5007)/\lambda 4363$ $T_{\rm e}$(O III)
[N II $(\lambda 6548 + \lambda 6584)/\lambda 5755$ $T_{\rm e}$(N II)
[O I $(\lambda 6300 + \lambda 6364)/\lambda 5577$ $T_{\rm e}$(O I)
[Ar III $(\lambda 7136 + \lambda 7751)/\lambda 5192$ $T_{\rm e}$(Ar III)
[C I $(\lambda 9823 + \lambda 9849)/\lambda 8728$ $T_{\rm e}$(C I)


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