About the Authors

Frédéric Pincet

To whom correspondence should be addressed. E-mail: pincet@lps.ens.fr

Affiliation Laboratoire de Physique Statistique, Ecole Normale Supérieure, Paris, France

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FP. Performed the experiments: FP. Analyzed the data: FP. Wrote the paper: FP.