1. Department of Chemical Engineering, Stanford University, Stanford, California
2. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California
3. Stanford Synchrotron Radiation Lightsource, Stanford Linear Accelerator National Accelerator Laboratory, Menlo Park, California
4. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 4Vision Science Group, University of California, Berkeley, Berkeley, California