About the Authors
Département de Physique and GÉPROM, Université de Montréal, Montréal, Québec, Canada
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JNL NM. Performed the experiments: JNL. Analyzed the data: JNL NM. Contributed reagents/materials/analysis tools: JNL NM. Wrote the paper: JNL NM.