About the Authors

Magnus Ivarsson

Magnus.ivarsson@nrm.se

Affiliation Department of Palaeobiology and the Nordic Center for Earth Evolution (NordCEE), Swedish Museum of Natural History, Stockholm, Sweden

Curt Broman

Affiliation Department of Geological Sciences, Stockholm University, Stockholm, Sweden

Håkan Gustafsson

Affiliation Department of Biomedical Engineering (MTÖ), County Council of Östergötland, Radiation Physics, Department of Medicine and Health Sciences, Linköping University, Linköping, Sweden

Nils G. Holm

Affiliation Department of Geological Sciences, Stockholm University, Stockholm, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MI. Performed the experiments: MI CB HG. Analyzed the data: MI CB HG NGH. Contributed reagents/materials/analysis tools: MI CB HG. Wrote the paper: MI.