About the Authors

Adam R. Brandt

abrandt@stanford.edu

Affiliation Department of Energy Resources Engineering, Stanford University, 367 Panama St., Stanford, CA 94035, United States of America

Yuchi Sun

Affiliation Department of Energy Resources Engineering, Stanford University, 367 Panama St., Stanford, CA 94035, United States of America

Sharad Bharadwaj

Affiliation Department of Energy Resources Engineering, Stanford University, 367 Panama St., Stanford, CA 94035, United States of America

David Livingston

Affiliation Carnegie Endowment for International Peace, 1779 Massachusetts Ave. NW, Washington, DC 20036, United States of America

Eugene Tan

Affiliation Carnegie Endowment for International Peace, 1779 Massachusetts Ave. NW, Washington, DC 20036, United States of America

Deborah Gordon

Affiliation Carnegie Endowment for International Peace, 1779 Massachusetts Ave. NW, Washington, DC 20036, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: ARB DG. Performed the experiments: YS SB ET. Analyzed the data: YS SB ET. Wrote the paper: ARB DL DG.