Contour plots of difference electron densities on the sections cross the [110] and [011] planes of the simulated box in the liquid (3800 K) and amorphous solid (300 K) of Ta system. The red and green balls denote central and shell atoms of icosahedral clusters. The blue balls denote residual atoms in other local atomic configurations without the tracked icosahedra. The black dash lines are for guides to the eyes.