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Fig. 3. Relationship between net CO2 assimilation integrated over 1 h (hourly An) and hourly incident PAR of individual leaves, for the same data shown in Fig. 1 (almond on 20 June 2003). Data for each hour (i.e. 0600–0700 . . . 1900–2000 h) are plotted using different symbols. The regression (not shown for clarity of graphs) had a significant quadratic component (P < 0·001).
