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Ferric-reducing antioxidant power (FRAP) of bilberries (μmol TE/g FW). Different letters above the same color bars indicate significant differences between the mean values (p < 0.05). Significant differences between 2019 and 2020 are indicated by asterisks (*) (p < 0.05). Locations of bilberry samples collection include Norway (NOR), Finland (FIN), Latvia (LVA) and Lithuania (LTU).
