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Astron. Astrophys. 335, 421-430 (1998)
Acknowledgements
We thank the referee Dr. Smartt for his constructive comments which have helped improve the presentation of these data.
The William Herschel Telescope is operated on the island of La
Palma by the Isaac Newton Group in the Spanish Observatorio del Roque
de los Muchachos of the Instituto de
Astrof
sica de Canarias.
© European Southern Observatory (ESO) 1998
Online publication: June 18, 1998
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