About the Authors

Oriol Güell

Contributed equally to this work with: Oriol Güell, Francesc Sagués, M. Ángeles Serrano

oguell@ub.edu

Affiliation Departament de Química Física, Universitat de Barcelona, Barcelona, Spain

Francesc Sagués

Contributed equally to this work with: Oriol Güell, Francesc Sagués, M. Ángeles Serrano

Affiliation Departament de Química Física, Universitat de Barcelona, Barcelona, Spain

M. Ángeles Serrano

Contributed equally to this work with: Oriol Güell, Francesc Sagués, M. Ángeles Serrano

Affiliation Departament de Física Fonamental, Universitat de Barcelona, Barcelona, Spain

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: OG FS MAS. Contributed reagents/materials/analysis tools: OG FS MAS. Wrote the paper: OG FS MAS.