Table 8: Empirical temperatures yielded by the spectra of the zones N, SW and SE and of the whole cluster.
zone $T_{\rm opt}($ O III) T(O II) T(S II) T(N II) $T_{\rm IR}($ O III)

N 9990 9860 7960 10 090 9580

SW 10 220 10 080 8070 10 300 9760

SE 11 610 11 450 8830 11 610 10 880

All 10 840 10 740 8430 10 920 10 250

**Table 8:** Empirical temperatures yielded by the spectra of the zones N, SW and SE and of the whole cluster.
zone	$T_{\rm opt}($ O III)	T(O II)	T(S II)	T(N II)	$T_{\rm IR}($ O III)
N	9990	9860	7960	10 090	9580
SW	10 220	10 080	8070	10 300	9760
SE	11 610	11 450	8830	11 610	10 880
All	10 840	10 740	8430	10 920	10 250

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