Figure 2: Summary boxplots of Uinta Mountain sample data.
From: Agriculture causes nitrate fertilization of remote alpine lakes
(a) NO3− (μM), (b) NH4+ (μM), (c) δ15N-NO3− (‰), (d) δ18O-NO3− (‰) and (e) Δ17O-NO3− (‰). The median is represented by the horizontal black bar, the lower and upper boundaries of the box represent the lower (25%) and upper (75%) quartiles of the data and the whiskers represent the minimum and maximum values, excluding outliers. Outliers are represented as points outside the whiskers. The NO3− sample concentrations reported here are higher than the true average for these Uinta Mountain sites, because sample selection for isotopic analysis was limited by nitrate concentration.
