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Total amount of the flavone poncirin (A) and the coumarins dihydroxy-osthol (B) and marmin (C) in the methanol (M) and water (W) extracts of fresh (F) and steam exploded (S) Star Ruby (Star), Rio Red (Rio) and Ruby Red (Ruby) whole grapefruit (WG) and grapefruit juice processing residues (GP). Absence of error bars indicates the Standard Error of the Mean was too small to be visible.
