About the Authors
Department of Mathematics, Uppsala University, Uppsala, Sweden
Robotics Institute, Carnegie Mellon University, Pittsburgh, Pennsylvania, United States of America
School of Biological Sciences, University of Sydney, Sydney, Australia
The authors have declared that no competing interests exist.
Conceived and designed the experiments: AJWW. Performed the experiments: AJWW JEH-R. Analyzed the data: RPM AP DJTS DS RG AJWW. Contributed reagents/materials/analysis tools: RPM AP DS DJTS. Wrote the paper: RPM DJTS AP.