About the Authors

Alexandra Peacock-Villada

Affiliation Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, United States of America

Vincent Coljee

Affiliation Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, United States of America

Claudia Danilowicz

danilow@fas.harvard.edu

Affiliation Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, United States of America

Mara Prentiss

Affiliation Department of Physics, Harvard University, 17 Oxford St., Cambridge, MA 02138, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: VC MP. Performed the experiments: APV CD. Analyzed the data: APV VC CD MP. Contributed reagents/materials/analysis tools: APV VC CD. Wrote the paper: VC CD MP.