Astron. Astrophys. 363, 1177-1185 (2000)

Acknowledgements

The authors thank doctors M.A. Gigosos, C. Pérez and M.I. de la Rosa for their valuable suggestions and comments, S. González for his collaboration in the experimental arrangement, and the Spanish Dirección General de Investigación Científica y Técnica (Ministerio de Educación y Ciencia) and the Consejería de Educación y Cultura de Castilla y León for their financial support under contracts No. PB98-0356 and VA23-99 respectively. Dr. J.A. Aparicio wants to express his personal acknowledgement to the Organización Nacional de Ciegos de España (ONCE) for his help.

© European Southern Observatory (ESO) 2000

Online publication: December 5, 2000
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