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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Peter Löwe conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, performed the computation work, authored or reviewed drafts of the paper, approved the final draft.

Vaclav Petras conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, performed the computation work, authored or reviewed drafts of the paper, approved the final draft.

Markus Neteler conceived and designed the experiments, performed the experiments, analyzed the data, authored or reviewed drafts of the paper, approved the final draft.

Helena Mitasova conceived and designed the experiments, performed the experiments, analyzed the data, authored or reviewed drafts of the paper, approved the final draft.

Data Deposition

The following information was supplied regarding data availability:

GRASS GIS SVN REPOSITORY

https://trac.osgeo.org/grass/browser/sandbox/wenzeslaus/g.citation

Funding

The authors received no funding for this work.


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