Figure 6

The mean square displacement (MSD) < Δr²(t)) > of the moving grains for different states of grain monolayer, solid and liquid, at different values of the coupling parameter, Γ^*: 1—Γ^* = 525; 2—Γ^* = 280; 3—Γ^* = 269; 4—Γ^* = 89; 5—Γ^* = 31.