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Additional Information

Competing Interests

Ted Habermann is the Director of Earth Science at The HDF Group. The authors declare that they have no competing interests.

Author Contributions

Ted Habermann conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, performed the computation work, authored or reviewed drafts of the paper, approved the final draft.

Data Deposition

The following information was supplied regarding data availability:

The data I analyzed came from the codemeta project. The URL and the access date are included in the manuscript references.


Parts of this material are based upon work supported by the National Science Foundation under Grant No. NSFDACS11C1675 and by NASA/GSFC under Raytheon Co. contract number NNG15HZ39C. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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