Figure 4.

MDA-MB-231 cells follow Lévy but not Brownian statistics. The distribution of the normalized x-velocity is fitted to various statistical models. Dotted lines are from experiments with no CCL19 (control), and solid lines are fits to the models. (a) The fits to Gaussian versus Crystal ball function. (b) The fit to the tail end of the data to Lévy and exponential model. Here, pv is the probability value calculated using a chi-squared calculator, representing the goodness of fit. The best fit is represented by pv = 1. wAIC is the Akaike weight from Akaike Information Criterion, a second criterion used here to evaluate the goodness of fit.