Distribution of 64 large C-complex asteroids in the retrieved inversion angle α₀ and absolute polarization minimum |P_min| space (panels a and b), along with the size of the asteroids (panel c). Guidelines in panels a and b represent the borders of surface regimes dominated by different-size regolith particles (Geake & Dollfus 1986): the left border separates the boulder and bare-rock regoliths (leftmost) and particular surface domain (intermediate) and the right one divides the particulate domain and fine-dust regoliths (rightmost). Different colors are assigned to different taxonomic types. Panel c illustrates the distribution of asteroids in the particulate domain.