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Comparison between the predicted data (ANL) and the data obtained experimentally (LAB) for the reference variables. (a) Fv/Fm; (b) Relative electrolyte leakage; (c) Relative chlorophyll content; (d) Carbon use efficiency. RSQ, coefficient of determination; SEP, standard error of prediction (internal validation); SEP(C), standard error of prediction corrected for the bias.
