Affiliation: | 1. Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Stra?e 1, D-85748, Garching, Germany 2. Foundation for Research and Technology Hellas, Institute of Electronic Structure and Laser, P.O. Box 1527, G-71110, Heraklion, Crete, Greece 3. Department of Physics, University of Crete, Crete, Greece
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