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Change in polyunsaturated fatty acid fraction of rapeseed oil in the climate treatments, CO2, T, O3, CO2+T and CO2+T+O3, relative to the ambient value (% change±standard error). The polyunsaturated fatty acids were C18:2 and C18:3. Derived from Eqn (1). (***P<0.0001, **P<0.01, *P<0.05.)
