Figure 8.

Representation of the behavior of a Brownian movement seen with two different acquisition times [34]. The center dot represents the particle and the arrows are the displacements detected. The same track is represented with two different observation time lags, on the left $\mathsf{\Delta }t$ and on the right $2\mathsf{\Delta }t$. The shaded circles represent the diffusion area where a particle should be found after a diffusion time of $\mathsf{\Delta }t$ (first circle) and $2\mathsf{\Delta }t$ (second circle) if we take as radius the square of Equation (5).