Table 10: Coefficients of the best-fit polynomials for the observed relations between the additional emission-line flux ratios and the oxygen abundance, where $\log~R = b_0 + b_1 y + b_2 y^2 + b_3 y^3$ [ $y \equiv 12+\log($ O/H)].
Flux ratio (log R) b₀ b₁ b₂ b₃

log [F([Ne III] $\lambda$ 3869)/F([O II] $\lambda$ 3727)] -8.2202E+1 +3.2014E+1 -4.0706E+0 +1.6784E-1

log [F(H $\alpha$ +[N II] $\lambda \lambda$ 6548,6584)/F([S II] $\lambda$ 6720)] -1.4789E+2 +5.9974E+1 -7.8963E+0 +3.4069E-1

log [F([O III] $\lambda$ 5007)/F(H $\beta$ )] -5.7906E+1 +1.5437E+1 -1.0872E+0 +9.1853E-3

log [F([O II] $\lambda$ 3727)/F(H $\beta$ )] +1.5253E+2 -6.1922E+1 +8.2370E+0 -3.5951E-1

**Table 10:** Coefficients of the best-fit polynomials for the observed relations between the additional emission-line flux ratios and the oxygen abundance, where $\log~R = b_0 + b_1 y + b_2 y^2 + b_3 y^3$ [ $y \equiv 12+\log($ O/H)].
Flux ratio (log R)	b₀	b₁	b₂	b₃
log [F([Ne III] $\lambda$ 3869)/F([O II] $\lambda$ 3727)]	-8.2202E+1	+3.2014E+1	-4.0706E+0	+1.6784E-1
log [F(H $\alpha$ +[N II] $\lambda \lambda$ 6548,6584)/F([S II] $\lambda$ 6720)]	-1.4789E+2	+5.9974E+1	-7.8963E+0	+3.4069E-1
log [F([O III] $\lambda$ 5007)/F(H $\beta$ )]	-5.7906E+1	+1.5437E+1	-1.0872E+0	+9.1853E-3
log [F([O II] $\lambda$ 3727)/F(H $\beta$ )]	+1.5253E+2	-6.1922E+1	+8.2370E+0	-3.5951E-1

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