2D distribution of magnetic field orientation angles for E₂ (panel a) together with the marginal distributions of ϕ and θ in light gray in panels b and c. The white contours in panel a represent the fitted function, and its marginal distributions are in black in panels b and c. We also plot in panels b and c the marginal distributions corresponding to quiet solar wind (red) and switchback (blue) populations, with lines indicating their mean. The curves in lighter red, blue, and black give a sense of the fit precision. Finally, in dashed red we display the quiet solar wind distribution found for E₂ 2 as displayed in Fig. 2 but multiplied by (1 − γ) so that the scales are comparable. See the text for more detail.