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Cellina di Nardò olives. The images represent four of the eight Maturity Index (MI) classification groups (0–7) of olives described by Guzman et al. [16]. Stage 0: green olives; Stage 2: Olive peel partially pigmented and green pulp; Stage 4: dark/black peel and yellow pulp; Stage 7: dark/black peel and pulp.
