Left panel: column density of dust grains as a function of the inclination angle θ. The dust column densities are larger at high inclinations, as seen in the figure. The steep drop in column densities toward low inclinations (low θ, high z) is attributed to the lowering of the gas densities and the scarcity of seeds owing to the coagulation of multiple seeds into one grain. Right panel: column densities of the gas, dust precursors (seeds), and dust grains as a function of the inclination angle θ.