Back to the Abstract

	1 Introduction
	2 Model assumptions
	3 Convergence behaviour of models
	4 Comparison of calculated and observed quantities
	5 Discussion
	6 Conclusions
	References
	Online Material
	Appendix A: Atomic data for NLTE calculations
	Appendix B: Details of linearization of rates
	Appendix C: Details of linearization of raditive heating/cooling term

	List of tables
	List of figures