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Figure 2b. (a) Histogram shows a typical displacement distribution due to diffusion in a one-dimensional model. For each displacement distance r (x-axis) there is a corresponding probability n/N (y-axis), which is the proportion of molecules within a voxel that were displaced that distance within a time interval 
(the duration of the diffusion experiment). The top of the histogram is centered on zero, indicating that most molecules had the same position at t = 0 and t = . The proportion of molecules that traveled the given distance r is indicated by the dotted red line. The horizontal color bar, in which blue signifies a high probability and red a low probability of displacement, shows the same Gaussian distribution. (b) Histogram shows a typical displacement distribution due to flux (ie, nonzero average displacement). All the molecules have moved the given distance r, as shown by N/N = 1.
