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Absolute ARG copy number ratio between wastewater influents and effluents (effluent:influent) (a) by site and (c) by season, and antibiotic concentration ratio between wastewater influents and effluents (effluent:influent) (b) by site and (d) by season. Black points represent the median of the posterior distributions of the effluent:influent ratios. Dotted lines are plotted at a ratio of 1:1 indicating no difference between influent and effluent.
