Statistical results in 1000 simulated isotropic datasets. The blue and purple colors represent the statistical results of isotropic analyses (isotropy) and isotropic analyses that preserve the spatial inhomogeneity of real data (isotropy RP); that is, 3.42σ and 3.62σ, respectively. The black curve is the best-fitting result to the Gaussian function. The solid and vertical dashed black lines are commensurate with the mean and the standard deviation, respectively. The vertical red line shows the AL_max derived from the real data.