1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2. School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA
3. Information Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
4. Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
5. Dipartimento di Fisica e Astronomia, Università di Firenze, Sesto Fiorentino, Florence 50019, Italy
6. Department of Mathematics, University of California Davis, Davis, California 95616, USA
7. Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA