PSPimpact rates (diamonds) and the normalised cumulative fluxes relative to PSP of charged dust with the radii above 30 nm (dashed line) and above 100 nm (solid line), shown in a logarithmic plot as functions of the heliocentric distance along the orbit of PSP. Both incoming (the upper branch) and outgoing parts of the orbit are shown. The PSP impact rates and the flux of the dust above 100 nm size approximately follow the 1/r² law as for the case of free expansion, while the flux of the dust between 30 and 100 nm is steeper in the peak region.