As in Fig. 5, but the argument of perihelium of the parent body orbit is 0° in heliographic coordinates (the point of perihelium lies in the solar equator plane). The cases illustrated correspondto different inclinations of the parent body orbits. The numbers 1–7 mark the inclinations 0°, 20°, 50°, 70°, 85°, 110°, and 180°, respectively. Also shown are the results from numerical solutions to the full equations of motion for Q∕m = 10⁻⁴ e/m_p grains. The cases shown are constant speed SW, no PR drag (diamonds); the same with PR drag included (triangles); distance-dependent SW speed (model 2) with PR drag included (squares); model 2 with both PR and the proton drag (× symbols).