Table 6: Coefficients of the best-fit polynomials for the observed relations between the 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 R₂₃ +1.2299E+0 -4.1926E+0 +1.0246E+0 -6.3169E-2

log [F([N II] $\lambda6584$ )/F(H $\alpha$ )] +9.6641E+1 -3.9941E+1 +5.2227E+0 -2.2040E-1

log [F([O III] $\lambda$ 5007)/F([N II] $\lambda$ 6584)] -2.3218E+2 +8.4423E+1 -9.9330E+0 +3.7941E-1

log [F([N II] $\lambda$ 6584)/F([O II] $\lambda$ 3727)] -1.2894E+2 +4.8818E+1 -6.2759E+0 +2.7101E-1

log [F([N II] $\lambda$ 6584)/F([S II] $\lambda$ 6720)] -8.0632E+1 +3.1323E+1 -4.1010E+0 +1.7963E-1

log [F([O III] $\lambda$ 5007)/F([O II] $\lambda$ 3727)] -1.4089E+0 +1.3745E+0 -1.4359E-1 --

**Table 6:** Coefficients of the best-fit polynomials for the observed relations between the 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 R₂₃	+1.2299E+0	-4.1926E+0	+1.0246E+0	-6.3169E-2
log [F([N II] $\lambda6584$ )/F(H $\alpha$ )]	+9.6641E+1	-3.9941E+1	+5.2227E+0	-2.2040E-1
log [F([O III] $\lambda$ 5007)/F([N II] $\lambda$ 6584)]	-2.3218E+2	+8.4423E+1	-9.9330E+0	+3.7941E-1
log [F([N II] $\lambda$ 6584)/F([O II] $\lambda$ 3727)]	-1.2894E+2	+4.8818E+1	-6.2759E+0	+2.7101E-1
log [F([N II] $\lambda$ 6584)/F([S II] $\lambda$ 6720)]	-8.0632E+1	+3.1323E+1	-4.1010E+0	+1.7963E-1
log [F([O III] $\lambda$ 5007)/F([O II] $\lambda$ 3727)]	-1.4089E+0	+1.3745E+0	-1.4359E-1	--

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