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Article Contents
1 Introduction
2 Chemical model and method of uncertainty
3 The sensitivity to $\zeta {_{\rm He}} / \zeta {_{\rm H_2}}$ in the high-metal case
4 Sensitivity for different model parameters
5 Bistability
6 Chemical reactions involved in the sensitivity
7 Observational relevance
8 Conclusions
References

List of tables
List of figures

Copyright ESO 2006
Published by EDP Sciences