Demonstrating the posterior distributions of the mean vs. that of the difference in means, using the BEST method (see text). Top: posterior distributions of the mean third nearest neighbor surface density for galaxies with outermost breaks of Type IId and IIIs. Bottom: posterior distribution of the difference in the mean between Type IId and IIIs galaxies. The green dashed line shows the median of this distribution, while the orange dashed line shows Δμ = 0.0. The means differ by ∼1.7σ, and likewise the posterior distribution of Δμ peaks below 0.0 with ∼95% confidence.