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Article Contents
1 Introduction
2 Observations
3 The observed sample
4 Analysis and discussion
5 Conclusions
Online Material
Appendix A: Conventional Be shell stars
Appendix B: Stars with emission $\Leftrightarrow $ emission & shell transitions
Appendix C: Bn stars with weak disk absorption signature

List of tables
List of figures

Copyright ESO 2006
Published by EDP Sciences