Peculiar velocity distributions of galaxies within 6000 km s⁻¹ of six example galaxy clusters. The members are marked with red bars. The black dashed lines indicate the positions of the BCGs selected by visual inspection. The shaded areas represent the 1σ, 2σ, and 3σ regions from darkest to lightest. The cluster names are indicated in the upper left corners of each panel. The bin sizes are 250 km s⁻¹.