Fig. 4. Model evaluation for the chamber Low GWL-3 in the September data set. (a) The solid curve is the estimated expected values for Eq. [8], and the slopes of the lines are the emission rates estimated by linear regression (dashed) and the method based on Eq. [8] (dotted). (b) Quantile plot of the estimated uniform residuals. If Eq. [8] is a valid model for the data, the points should be scattered unsystematically around the identity line