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Linear correlations of mean LER (each n = 20 leaves) and air temperature at 5cm above ground for each of the four wheat varieties. Grey dots refer to week 1 (leaf 7) and black triangles to week 2 (leaf 8) of the experiment. The histograms in the upper left corners show LER corrected for thermal time (LER − aT) for week 1 and 2. Note: there is no data for week 2 for variety ‘Combin’.
