Dependence of the properties of HSSs at 1 AU on their area and longitudinal width close to the Sun. Top: peak velocity of HSSs at 1 AU versus their longitudinal widths (left) and versus the areas of their source coronal holes at the solar surface (right). Bottom: temperatures (left) and densities (right) of the HSS plasma parcels that have the peak velocity at 1 AU versus the longitudinal widths of the HSSs. The data were derived for latitudinal displacements of 0°, 3°, 6°, 9°, and 12° to the center of the HSS.