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Astron. Astrophys. 350, L19-L22 (1999)
Acknowledgements
We greatly appreciate the OGLE collaboration, and Dr. Andrzej
Udalski in particular, for permission to use their data for this
publication. I thank Matthias Bartelmann, Martin Dominik, Bohdan
Paczy
ski, Andrzej Udalski,
Hans Witt and particularly the referee Eric Aubourg for valuable
discussions and comments on the paper.
© European Southern Observatory (ESO) 1999
Online publication: October 4, 1999
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