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Scatterplots of ptaquiloside concentrations (µg·g−1) versus (a) x and (b) y coordinates (N—north; S—south; E—east; W—west) for fronds sampled in July 2015; Mweelin Well, Dooghill, Doolargy, Whitepark Bay, Glenarm, Churchtown, Drumsurn, Bann Estuary and Murlough.
