Solar wind: boxplot diagrams in the first two panels show the mean (diamond symbol), median (horizontal line), and 25%–75% percentiles of (a) γ and (b) D values for overall data by cycle, and by total cycle-independent phases, according to the following classification: slow and fast for speeds under and over 500 km s⁻¹, respectively. The whisker indicates the range between minimum and maximum values calculated. (c) Scatter plot between the mean values of γ and D for solar wind without classifying (black), slow wind (blue), and fast wind (red).