About the Authors

John M. Rensberger

rensb@u.washington.edu

Affiliation Department of Earth and Space Sciences, University of Washington, Seattle, Washington, United States of America

Ricardo N. Martínez

Affiliation Museo de Ciencias Naturales, Universidad Nacional de San Juan, San Juan, Argentina

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JMR RNM. Performed the experiments: JMR. Analyzed the data: JMR RNM. Contributed reagents/materials/analysis tools: JMR RNM. Wrote the paper: JMR RNM.