About the Authors

Grace S. Chiu

grace.chiu@csiro.au

Affiliation CSIRO Mathematics, Informatics and Statistics, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Canberra, Australian Capital Territory, Australia

Margaret A. Wu

Affiliation Business Methods Survey Division, Statistics Canada, Ottawa, Ontario, Canada

Lin Lu

Affiliation McGregor GeoScience, Bedford, Nova Scotia, Canada

Competing Interests

The authors confirm that Dr. LL's employment at McGregor GeoScience does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: GSC. Performed the experiments: GSC MAW. Analyzed the data: GSC MAW LL. Contributed reagents/materials/analysis tools: GSC MAW. Wrote the paper: GSC.