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Fig. 3. Boxplots of the potentially toxic elements (PTE) contents (mg kg^–1) in the three cities. Boxes represent interquartile ranges (IQR) and stars are outliers, calculated as the values below Q₁–1.5·IQR and above Q₃+1.5·IQR. Whiskers are range excluding outliers. Medians are marked in each box with a line, means with a dot.