About the Authors

Michael R. Heath

m.heath@strath.ac.uk

Affiliation Department of Mathematics and Statistics, University of Strathclyde, Glasgow, Scotland, United Kingdom

Robin M. Cook

Affiliation Department of Mathematics and Statistics, University of Strathclyde, Glasgow, Scotland, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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