Affiliation: | 1. Faculty of Physics and Material Sciences Center, Philipps-Universit?t Marburg, Renthof 5, 35032, Marburg, Germany 2. Max-Planck-Institute for Dynamics and Self-Organization, Bunsenstra?e 10, 37073, Gottingen, Germany 3. Institute of Experimental Physics I, Justus-Liebig-Universit?t, Heinrich-Buff-Ring 16, 35392, Giessen, Germany 4. CNISM and Dipartimento di Fisica, Sapienza Universitá di Roma, Piazzale A. Moro 2, 00185, Rome, Italy
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