About the Authors

Paola Causin

Paola.Causin@unimi.it

Affiliation Department of Mathematics “F. Enriques”, Università degli Studi di Milano, Milano, Italy

Giuseppe Facchetti

Affiliation Department of Mathematics “F. Enriques”, Università degli Studi di Milano, Milano, Italy

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: PC GF. Performed the experiments: PC GF. Analyzed the data: PC GF. Contributed reagents/materials/analysis tools: PC GF. Wrote the paper: PC GF.