Comparison of the Δ-variance spectra with the isotropic wavelet and Fourier spectra for the test structures from Figs. 11 and 2, i.e., a map containing 10 Gaussian clumps with a standard deviation of σ = 8 pixels (top panel) and a map containing a sinusoidal stripe pattern with a period of p = 32 pixels (bottom panel). All spectra are plotted using the amplitude rescaling, M∕s², that always guarantees a peak. The wavelet spectra were computed for localization parameters and .