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Article Contents
1 Introduction
2 ISO observations and data analysis
3 Fabry-Perot line profile analysis
4 Dependence of the atomic line emissionon the stellar parameters
5 Comparison with PDR emission theory
6 Comparison with line emission theoryfor shocked regions
7 Calculation of the low-excitation atomic mass in PPNe
8 Conclusions

Copyright ESO 2001
Published by EDP Sciences