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Article Contents
1 Introduction
2 Observations
3 Results
4 Approximate analysis
5 Protostellar envelope model
6 Discussion
7 Conclusions
Online Material
Appendix A: Density and temperature profile of L1448-N
Appendix B: Models predictions for formaldehyde lines fluxes

List of tables
List of figures

Copyright ESO 2004
Published by EDP Sciences