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Supplemental Information

Additional Information

Competing Interests

All authors were employees of the International Potato Center at the time of designing the khipu chart and software described.

Author Contributions

Reinhard Simon conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Pablo Carhuapoma performed the experiments, analyzed the data, reviewed drafts of the paper.

Vilma Hualla contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Marc Ghislain conceived and designed the experiments, reviewed drafts of the paper.

Felipe de Mendiburu contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Rene Gomez contributed reagents/materials/analysis tools, reviewed drafts of the paper.

Cinthya Zorilla contributed reagents/materials/analysis tools, reviewed drafts of the paper.

William Roca wrote the paper, reviewed drafts of the paper.

Stef de Haan conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

Merideth Bonierbale conceived and designed the experiments, wrote the paper, reviewed drafts of the paper.

Data Deposition

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

The R based package 'quipu' is available from the R repository: http://cran.at.r-project.org/web/packages/quipu/

Funding

The author declares there was no funding for this work.


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