Comparison of the normalized spectra of the isotropic wavelet coefficients (top panel) and the local degree of anisotropy (bottom panel) for maps containing random projections of ten 3D Gaussian rotational ellipsoids with sizes of σ = 3 × 3 × 27 pixels and σ = 3 × 27 × 27 pixels. The green line shows the result for a map consisting of ten 2D Gaussian ellipses with σ = 3 × 27 pixels.