Data files in data/ and aggregates/ are licensed under
Creative Commons Attribution 4.0 International (CC BY 4.0).

You are free to share and adapt the material for any purpose, even
commercially, under the condition that you give appropriate credit.

Full legal text: https://creativecommons.org/licenses/by/4.0/legalcode
Human-readable summary: https://creativecommons.org/licenses/by/4.0/

Attribution: cite the accompanying paper and this dataset's DOI
(see README.md, "How to cite").
