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Fig. 5. Boxplots of the potentially toxic elements (PTE) contents (mg kg^–1) in the three cities according to land uses. 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. Numbers are median values.