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Article Contents
1 Cluster radio relics and the case of A 521
2 Radio observations and data reduction
3 A 521 at 327 MHz
4 The relic region at 4.9 and 8.5 GHz
5 Spectral index image of the relic
6 Integrated radio spectrum of the relic
7 Discussion
8 Summary and conclusions
Appendix A: Preliminary results of the GMRT follow up at 235 MHz

List of tables
List of figures

Copyright ESO 2008
Published by EDP Sciences