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a, b, c, and d show the typical distribution of the solute concentration (diffusion) in the solid matrix of grape pieces during extraction as determined by a finite element analysis after t = 10 s, t = 50 s, t = 100 s, or t = 150 s, respectively, for the component polyphenols. The bar below each shape represents the content concentration (%) within a particle region at a given time.
