Logarithms of the normalised m = 2 scattering coefficients of a 256 × 256 column density map from an MHD simulation (class 4, see Appendix B). The coefficients are given in lexicographical order (j₁, θ₁, j₂, θ₂). In the top panel, the fit using Eq. (14) is shown (dashed orange line) on top of the data (solid blue line). In the bottom panel, we show the residuals normalised to the standard deviation. Dotted lines correspond to ±2σ.