About the Authors

Michael C. Münnix

Contributed equally to this work with: Michael C. Münnix, Rudi Schäfer

michael@muennix.com

Affiliation Faculty of Physics, University of Duisburg-Essen, Essen, Germany

Rudi Schäfer

Contributed equally to this work with: Michael C. Münnix, Rudi Schäfer

Affiliation Faculty of Physics, University of Duisburg-Essen, Essen, Germany

Thomas Guhr

Affiliation Faculty of Physics, University of Duisburg-Essen, Essen, Germany

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MCM RS TG. Performed the experiments: MCM RS. Analyzed the data: MCM RS. Contributed reagents/materials/analysis tools: MCM RS TG. Wrote the paper: MCM RS.