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Mean daily quantum flux density (Qint, mol m−2 day−1), mean diurnal (from dawn to sunset) vapour pressure deficit (VPD, kPa) and maximum diurnal (from dawn to sunset) vapour pressure deficit (VPDmax, kPa) for the Mediterranean (MED) and temperate (TEM) sites during the growing season of 2012 (from April to September). Data are mean ± SE. All the values were statistically different (P < 0.05) between sites.
