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)

**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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