Back to the Abstract

	1 Introduction
	2 Observations
	3 Results
	4 Approximate analysis
	5 Protostellar envelope model
	6 Discussion
	7 Conclusions
	References
	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