Table 9: O++/H+ and Ne++/O++ abundance ratios derived from different diagnostics. The error bars include the uncertainties related to the temperature diagnostics and to the [O III]/H$\beta $ and [Ne III]/[O III] line ratios that we used.
Set of data Temperature Line ratio Abundance ratio
O++/H+
Optical slit $T_{\rm opt}($O III $)=1140\pm180$ K [O III]$\lambda $5007/H $\beta=4.05\pm0.18$ $(1.04\pm0.07)\times10^{-4}$
Integrated $T_{\rm IR}($O III $)=8420\pm690$ K [O III]$\lambda $5007/H $\beta=3.52\pm0.20$ $(2.55\pm0.72)\times10^{-4}$
Ne++/O++
Optical slit $T_{\rm opt}($O III $)=1140\pm180$ K [Ne III] $\lambda3869$/[O III] $\lambda5007=0.0911\pm0.0047$ $0.257\pm0.014$
Integrated $T_{\rm IR}($O III $)=8420\pm690$ K [Ne III] $\lambda16\mu$m/[O III] $\lambda88~\mu$m $ = 0.257\pm0.085$ $0.164\pm0.059$


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Article Contents
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
List of tables
List of figures