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Article Contents
1 Introduction
2 The observations
3 Observational results
4 Observed properties of the ring-like structure
5 The nature of the ring in P, $\phi $ and RM
6 Connection of the ring with known ISM objects
7 The ring as a magnetic structure
8 Structure outside the ring
9 Conclusions
References

List of tables
List of figures

Copyright ESO 2003
Published by EDP Sciences