Table 3: Helium abundance
Parameter Value
$T_{\rm e}$(O III), K 20 180
$T_{\rm e}$(He+), K 20 010
$N_{\rm e}$(He+), cm-3 295
EW $_{\rm abs}$($\lambda $4471), Å 0.4
EW $_{\rm abs}$($\lambda $3889)/ EW $_{\rm abs}$($\lambda $4471) 1.0
EW $_{\rm abs}$($\lambda $5876)/ EW $_{\rm abs}$($\lambda $4471) 0.3
EW $_{\rm abs}$($\lambda $6678)/ EW $_{\rm abs}$($\lambda $4471) 0.1
EW $_{\rm abs}$($\lambda $7065)/ EW $_{\rm abs}$($\lambda $4471) 0.1
$\tau$($\lambda $3889) 2.9
$\Delta$ $I_{\rm coll}$(H$\alpha $)/I(H$\alpha $), % 4.95
$\chi^2_{\rm min}$ 0.1825
y+($\lambda $3889) $0.0782\pm0.0134$
y+($\lambda $4471) $0.0802\pm0.0032$
y+($\lambda $5876) $0.0788\pm0.0012$
y+($\lambda $6678) $0.0787\pm0.0018$
y+($\lambda $7065) $0.0789\pm0.0018$
y+(weighted mean) $0.0789\pm0.0010$
y++($\lambda $4686) $0.0034\pm0.0002$
ICF(He) 0.993
y(weighted mean) $0.0817\pm0.0010$
Y(weighted mean) $0.2463\pm0.0030$


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