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Net leaf assimilation rate (An) in saturating light as a function of CO2 partial pressure in the intercellular air space (Ci). Example curves for rice (triangles), wheat (squares) and soya bean (circles) were redrawn, respectively, from the following sources [13–15]. Enlarged symbols show the net leaf assimilation rates when the external CO2 partial pressure equals that of the current atmospheric level of 39–40 Pa.
