Table 3: Empirical temperatures derived from five line ratios.
Line ratio Temperature (K)

[O III] $\lambda$ 4363/ $\lambda$ 5007 $11~140\pm180$

[O II] $\lambda\lambda$ 7320+30/ $\lambda$ 3727 $11~210\pm1180$

[S II] $\lambda\lambda$ 4069+76/ $\lambda\lambda$ 6716+31 $9860\pm940$

[N II] $\lambda$ 5755/ $\lambda$ 6583 $11~360\pm840$

[O III] $\lambda$ 5007/ $\lambda$ 88 $\mu$ m $8420\pm690$

**Table 3:** Empirical temperatures derived from five line ratios.
Line ratio	Temperature (K)
[O III] $\lambda$ 4363/ $\lambda$ 5007	$11~140\pm180$
[O II] $\lambda\lambda$ 7320+30/ $\lambda$ 3727	$11~210\pm1180$
[S II] $\lambda\lambda$ 4069+76/ $\lambda\lambda$ 6716+31	$9860\pm940$
[N II] $\lambda$ 5755/ $\lambda$ 6583	$11~360\pm840$
[O III] $\lambda$ 5007/ $\lambda$ 88 $\mu$ m	$8420\pm690$

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observational data and reduction
	3 Empirical diagnostics
	4 General strategy for model fitting
	5 Simple models
	6 Models with constrained density distribution
	7 Further refining of the models
	8 Sources of energy other than the ionizing flux
	9 Uncertainties in O/H and Ne/O
	10 Conclusion
	References
	Online Material
	Appendix A: Correction of Balmer lines used for dereddening
	Appendix B: Setting the geometric corrections A, B, and K