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Fig. 5. Nitrate concentrations in the treated subbasin (TR1) minus concentrations in the control subbasin (CN2) during the late spring nitrate test (LSNT) treatment period and the fitted quadratic model with a Lag 1 residual component at its 95% confidence limits. Concentrations from the two subbasins are significantly different when the confidence limits do not include the 0 difference line.