About the Authors

George E. Robinson

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Software, Visualization, Writing – original draft, Writing – review & editing

grob767@aucklanduni.ac.nz

Affiliation Department of Mathematics, The University of Auckland, Auckland, New Zealand

Graham M. Donovan

Roles Conceptualization, Funding acquisition, Methodology, Resources, Software, Supervision, Writing – original draft, Writing – review & editing

Affiliation Department of Mathematics, The University of Auckland, Auckland, New Zealand

Competing Interests

The authors have declared that no competing interests exist.