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The light intensity dependence of net photosynthesis of a chamber-grown tobacco leaf. The measurement temperature was 25°C and the [CO2] in the measurement chamber (LI-COR 6400-40) was 400 ppm. The data are fit to Equation 1, for which ΦCO2 = 0.059, Asat = 21.03 μmol CO2 m−2 s−1, θ = 0.79, and R = 1.65 μmol CO2 m−2 s−1.
