Average speed relative to PSP (solid line, diamonds) and the average velocity components: radial (dotted line, triangles), latitudinal (dashed, squares), and azimuthal (dotted-dashed, x signs) of 30–40 nm particles with β = 0.163 that encounter PSP along the second orbit. The symbols show the averages weighted by the radial flux (first method, the peak region). Lines show the averages obtained by using the latitudinal flux (second method). See Sect. 3and Appendix A for details.