Affiliation: | 1. Dept. of Physics and Astronomy, University of Aarhus, 8000, ?rhus C, Denmark 2. Physics Dept., Stockholm University, SCFAB, 106 91, Stockholm, Sweden 3. Département de Physique, Université de Montréal, H3C 317, Montréal, Québec, Canada 4. Centre Interdisciplinaire de Recherche Ions Lasers, rue Claude Bloch, B.P. 5133, 14070, Caen Cedex 5, France
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