(a) Peak velocities of the HSSs as measured by the virtual spacecraft in the solar equatorial plane at 1 au vs. the width of rectangular coronal holes. In the first set (red), the latitudinal width of the rectangular coronal hole was fixed at 30° while the longitudinal width was varied. In the second set (blue), the longitudinal width was fixed at 30° while the latitudinal width was varied. (b) Latitudinal velocity profile of HSSs at a distance of 1 au to the Sun, for HSSs originating from circular coronal holes with areas of 1 (blue), 2 (red), 4 (green), and ﹩8\,\times \,{10}^{10}\,{\mathrm{km}}^{2}﹩ (yellow).