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Net CO2 assimilation rate (A) in response to Iinc (incident irradiance), Φ2Iinc (Φ2, photochemical efficiency of photosystem II) or γΦ2Iinc (γ, the lumped parameter in Equation 2) for wheat (T. aestivum) and sunflower (H. annuus). Data are mean ± SE (n = 6). Meaning of symbols of different CO2 treatments and measurement conditions are shown in Figure 2.
