1. Istituto per le Applicazioni del Calcolo, CNR, I-00161 Rome, Italy; INFN, Sezione di Ferrara, I-44100 Ferrara, Italy; Department of Physics and Department of Mathematics and Computer Science, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands; and International Collaboration for Turbulence Research;
2. Max Planck Institute for Dynamics and Self-Organization, D-37077 Goettingen, Germany; Laboratory of Atomic and Solid-State Physics and Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853; Institute for Nonlinear Dynamics, University of Goettingen, D-37073 Goettingen, Germany; and International Collaboration for Turbulence Research