Verification of the Gaussian hypothesis for all statistics computed in this analysis. For a Gaussian-distributed DV, the histogram of χ² values from the SLICS simulations (red) should match the theoretical prediction (black) modulo the sampling noise across the finite set of 924 realizations. The corresponding SMAPE value (Eq. (45)) is given in the top left quadrant of each panel. 𝒮 ≤ 0.15 indicates compatibility with the Gaussian hypothesis, which is verified for all statistics but the three bottom panels with gray shaded background. The y-axes correspond to the frequency of each χ² bin value across the SLICS and are different for each panel.