About the Authors

Kurt Ehlers

Affiliations Mathematics Department, Truckee Meadows Community College, Reno, Nevada, United States of America, Department of Atmospheric Sciences, Desert Research Institute, Nevada System of Higher Education, Reno, Nevada, United States of America

George Oster


Affiliation Department of Molecular & Cell Biology, and ESPM, University of California, Berkeley, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Performed calculations: KE. Wrote the paper: GO KE.