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Concentration of DOC (i) and VLP (ii) in the four WWTPs, and the mean (iii) and mode (iv) of the hydrodynamic diameters of the VLPs. The boxes show the 1st, 2nd, and 3rd quartiles. The whiskers extend 1.5 times the interquartile range and measured values outside this range are shown as circles. The data is based on samples collected after secondary treatment in each WWTP (Fig. S1, supplementary material).
