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Geometric means (points), 95% confidence intervals (bars), 90th percentiles (square symbols) and 95th percentiles (triangle symbols) of faecal indicator organism concentrations (colony forming units (cfu)/100 ml) by time of day at Swansea Bay designated sampling point during summer 2011 for all days (plots A and D) and groups of days with probability of gastrointestinal illness (pGI) ≤ 0.1 (Plots B and E) and >0.1 (Plots C and F).
