1. Department of Mathematics and Computer Science, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2. Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
3. Institute for Pure and Applied Mathematics, University of California Los Angeles, 460 Portola Plaza, Los Angeles, California 90095, USA
4. Computer, Computational, and Statistical Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
5. Deptartment of Electrical Computer and Energy Engineering, University of Colorado Boulder, 425 UCB, Boulder, Colorado 80309, USA
6. Renewable and Sustainable Energy Institute, University of Colorado Boulder, 4001 Discovery Dr., Boulder, Colorado 80303, USA
7. Physics and Chemistry of Materials Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
8. Netherlands eScience Center, Science Park 140, 1098 XG Amsterdam, The Netherlands