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	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
	References

	List of tables
	List of figures