Table 5: Coefficients of the best-fit polynomials for the observed relations between the emission-line flux ratios and the oxygen abundance, where $\log ~R = a_0 + a_1 x + a_2 x^2 + a_3 x^3$ [ $x \equiv$ log(Z/ $Z_\odot) \equiv 12+\log($ O/H)-8.69].
Flux ratio (log R) a₀ a₁ a₂ a₃

log R₂₃ +7.1806E-1 -6.9548E-1 -6.2220E-1 -6.3169E-2

log [F([N II] $\lambda6584$ )/F(H $\alpha$ )] -6.8307E-1 +8.9881E-1 -5.2302E-1 -2.2040E-1

log [F([O III] $\lambda$ 5007)/F([N II] $\lambda$ 6584)] +3.2921E-1 -2.2578E+0 -4.1699E-2 +3.7941E-1

log [F([N II] $\lambda$ 6584)/F([O II] $\lambda$ 3727)] -7.9322E-1 +1.1399E+0 +7.8929E-1 +2.7101E-1

log [F([N II] $\lambda$ 6584)/F([S II] $\lambda$ 6720)] -2.5214E-1 +7.4100E-1 +5.8181E-1 +1.7963E-1

log [F([O III] $\lambda$ 5007)/F([O II] $\lambda$ 3727)] -3.0777E-1 -1.1210E+0 -1.4359E-1 --

**Table 5:** Coefficients of the best-fit polynomials for the observed relations between the emission-line flux ratios and the oxygen abundance, where $\log ~R = a_0 + a_1 x + a_2 x^2 + a_3 x^3$ [ $x \equiv$ log(Z/ $Z_\odot) \equiv 12+\log($ O/H)-8.69].
Flux ratio (log R)	a₀	a₁	a₂	a₃
log R₂₃	+7.1806E-1	-6.9548E-1	-6.2220E-1	-6.3169E-2
log [F([N II] $\lambda6584$ )/F(H $\alpha$ )]	-6.8307E-1	+8.9881E-1	-5.2302E-1	-2.2040E-1
log [F([O III] $\lambda$ 5007)/F([N II] $\lambda$ 6584)]	+3.2921E-1	-2.2578E+0	-4.1699E-2	+3.7941E-1
log [F([N II] $\lambda$ 6584)/F([O II] $\lambda$ 3727)]	-7.9322E-1	+1.1399E+0	+7.8929E-1	+2.7101E-1
log [F([N II] $\lambda$ 6584)/F([S II] $\lambda$ 6720)]	-2.5214E-1	+7.4100E-1	+5.8181E-1	+1.7963E-1
log [F([O III] $\lambda$ 5007)/F([O II] $\lambda$ 3727)]	-3.0777E-1	-1.1210E+0	-1.4359E-1	--

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