Figure 6. Probability distribution graph after fitting of MC-LR in source water (μg/L).

The data comparison showed that the best-fitted distribution of MC-LR concentration was Gamma (μ 0.076, σ 0.070). The abscissa in Fig. 6 represents the concentrations of MC-LR; the concentrations are partitioned, the length of each interval is the group distance, the rectangular area is the frequency of the group, and the ratio of the total sample utilized, and the vertical axis is the frequency divided by the group distance obtained. The fitting results can be visually observed from the coincidence of the blue rectangular shape (90.0%) and the area under the red curve (88.0%).