1. Department of Astronomy, University of Illinois at Urbana-Champaign, 1002 West Green Street, Urbana, IL 61801, USA
2. National Center for Supercomputing Applications, 1205 West Clark Street, Urbana, IL 61801, USA
3. Advanced Visualization Laboratory, National Center for Supercomputing Applications, 1205 West Clark Street, Urbana, IL 61801, USA
4. Department of Physics and Astronomy, Purdue University, 525 Northwestern Avenue, West Lafayette, IN 47907, USA
5. Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801, USA