Figure 2 : Component Gaussian Mixture Model (GMM) (blue lines), superposition of the Gaussians (GMM) (red line), and the PDF describing sub-daily nitrate~ in-stream concentrations (black line).

From: Knowledge discovery from high-frequency stream nitrate concentrations: hydrology and biology contributions

Figure 2

The three modes (blue lines) of the GMM describe low (left, mean = −0.59, SD = 0.23), typical (centered, mean = 0.0053, SD = 0.21) and high (right, mean = 0.46, SD = 0.26) nitrate~ concentrations. Prior to data analysis nitrate concentrations were split by applying a two-component model, which describes seasonal and sub-daily fluctuations.