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Fig. 5. Distributions of reconstructed ${delta}$ ¹⁵N[NO₃^–]⁰ of ground water (including undenitrified samples) compared to points (diamonds) showing ${delta}$ ¹⁵N for surface soils, and box plots of ${delta}$ ¹⁵N values for aquifer sediments at all study sites. Values of ${delta}$ ¹⁵N are given with respect to air N₂, in parts per thousand. For the box plots, error bars show the minimum and maximum values, boxes show the interquartile range, and horizontal lines show the median.