Dependence of the optimal γ on 4 consecutively increasing γ ranges for all events where γ is found via reverse modeling (i.e. all CMEs except CME 1, 13 , 20 and 27 where no optimal γ was found). y-axis represents the γ value in ×10⁻⁷ km⁻¹, whereas on the x-axis four γ ranges are given: 1) 0.01–0.1, 2) 0.01–0.3, 3) 0.01–1, and 4) 0.01–10 ×10⁻⁷ km⁻¹. The boxes denote the interquartile range (IQR) limited by the 1st quartile (Q1: 25th percentile) and the 3rd quartile (Q3: 75th percentile), where 50% of the data are found. The median is represented by a red line, and the notches show the 95% confidence interval of the median. Whisker ranges define minimum and maximum values, defined as Q1 − 1.5 * IQR and Q3 + 1.5 * IQR, respectively. Outliers are marked with the red dots.