About the Authors

Sean P Stromberg

To whom correspondence should be addressed. E-mail: stromberg@physics.ucsb.edu (SPS), and carlson@physics.ucsb.edu (JC)

Affiliation Physics Department, University of California Santa Barbara, Santa Barbara, California, United States of America

Jean Carlson

To whom correspondence should be addressed. E-mail: stromberg@physics.ucsb.edu (SPS), and carlson@physics.ucsb.edu (JC)

Affiliation Physics Department, University of California Santa Barbara, Santa Barbara, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

JC and SPS conceived, designed, and performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, and wrote the paper.