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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Carlo Ricotta conceived and designed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Eszter EA Ari contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Giuliano Bonanomi contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Francesco Giannino contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Duncan Heathfield contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Stefano Mazzoleni conceived and designed the experiments, reviewed drafts of the paper.

Janos Podani contributed reagents/materials/analysis tools, wrote the paper, reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding the deposition of related data:

The program TreeCreeper can be freely downloaded from the Web site of the Laboratory of Applied Ecology and System Dynamics of the University of Naples:

http://www.ecoap.unina.it/doc/publications.htm

The source code can be freely downloaded from the Codeplex open source software repository web site: http://treecreeper.codeplex.com/

Funding

CR was funded by a grant of the University of Rome 'La Sapienza' (C26A13JZ89). JP was funded by the Hungarian Scientific Research Grant OTKA K106177. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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