 Between the blue curve and the black are other Pearson type VII densities with "γ"2 = 1, 1/2, 1/4, 1/8, and 1/16.The red curve again shows the upper limit of the Pearson type VII family, with formula_21 (which, strictly speaking, means that the fourth moment does not exist).The red curve decreases the slowest as one moves outward from the origin ("has fat tails").