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Commonly used definition for D(τ) (11) is the apparent diffusion coefficient 
which is found at time τ from the slope of a straight line between the origin and MSD(τ) (dotted line). The slope of the line is 2nDapp. The instantaneous diffusion coefficient 
is determined by the local slope of MSD(τ) at time τ (dashed line), with slope 2nDins.
