1. Center for Bio/Molecular Science and Engineering Code 6900, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
2. National Research Council, Washington, D.C. 20001, United States
3. Optical Sciences Division Code 5600, U.S. Naval Research Laboratory, Washington, D.C. 20375, United States
4. Jacobs Corporation, Hanover, Maryland 21076, United States