- Received July 6, 2016.
- Accepted October 7, 2016.
- Published online November 2, 2016.
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- 1Department of Plant Sciences, University of California, Davis, CA 95616, USA
- 2Department of Physics, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
- 3Department of Geological Sciences, Stanford University, Stanford, CA 94305, USA