We would like to thank Daniel Mc Intosh and Todd Boroson for providing us with the FeII template used for the line fitting. F. Courbin acknowledges financial support through Chilean grant FONDECYT/3990024. Additional support from the European Southern Observatory and through CNRS/CONICYT grant 8730 "Mirages gravitationnels avec le VLT: Distribution de matière noire et contraintes cosmologiques" is also gratefully acknowledged. Jean-Paul Kneib acknowledges support from CNRS.
© European Southern Observatory (ESO) 2000
Online publication: August 23, 2000