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The coeffa2, as defined by the United States Environmental Protection Agency via its SEDD Specification Version 5.2, is "the value of the second order coefficient in a polynomial equation. This element would be reported if using a quadratic fit."
- ↑ U.S. Environmental Protection Agency (March 2019). "Appendix A. Data Element Dictionary (DED)" (PDF). SEDD Specification Version 5.2. https://www.epa.gov/sites/default/files/2019-05/documents/sedd_spec_v5-2-march_2019_508.pdf. Retrieved 22 September 2022.