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Astron. Astrophys. 317, 670-675 (1997)

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Acknowledgements

The author thanks Dr. H. MacGillivray, who made available COSMOS magnitudes for several clusters. I am specially indebted to Dr. G. A. Tammann for his advice through all the stages of this project and to Drs. E. Salvador-Solé and J.-M. Solanes for valuable comments on an original version of the manuscript. Detailed comments by the referee, Dr. A. Mazure, helped improving the paper substantially. This research has made use of the Lyon-Meudon Extragalactic Database (LEDA, CRAL-Observatoire de Lyon) and of the NASA/IPAC Extragalactic Database (NED, JPL, Caltech). Support of the Swiss National Science Foundation is gratefully aknowledged.

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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