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Supplemental Information

Three examples of ellipse fitting

DOI: 10.7287/peerj.preprints.27421v3/supp-2

data of other 2D structures

DOI: 10.7287/peerj.preprints.27421v3/supp-4

Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

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

Data Deposition

The following information was supplied regarding data availability:

The raw data, R code and three examples for calculations.

Funding

This work was supported by the National Key Research and Development Program of China (2018YFD0900702). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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