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Fig. 1. Relationship between net CO2 assimilation integrated over a day (daily An) and daily incident PAR of individual leaves (circles) and for a hypothetical leaf at the top of the canopy (open square). Data are for almond on 20 June 2003. The regression shown is for the hypothetical leaf: y = 17·2x. Comparison between slopes (PhRUE) for the hypothetical leaf and for individual leaves and relative statistics are shown in Fig. 2.
