Velocity components and squared width of particle positions in the damped random walk model. Left panel: radial and vertical velocity components resulting from the damped random walk model. The turbulent speed is indicated with a blue circle and the mean measured speed with a black circle. Right panel: square of the standard deviation of the x-position of 1000 particles undergoing a damped random walk (black line). We compare to the squared ensemble width from the desired diffusion coefficient .