Left panel: the color map shows the total number density of dust grains composed of sizes ranging between 10 and ∼200 Å in polar (r, θ) coordinates. The black lines in the figure represent the parabolic flow lines with various starting/launch radii on the accretion disk, r₀. As seen in the figure, for each radius the number density of grains increases at higher inclinations, i.e., close to the plane of the accretion disk at θ ∼ 90°. The figure shows that the dust-forming region has a toroidal morphology. The three horizontal lines correspond to the inclination angles, for which the dust densities are shown in the right panel in the same color code. Right panel: the number density of dust grains is presented as a function of radial distance r for inclination angles θ = 30°, 75°, and 85°. The presence of a dust toroidal region at high inclination angles is further visible in the figure.