Fiducial data vector (gray) along with its derivatives with respect to Ω_m (red), σ₈ (green), and w (blue) for ST computed on κ maps smoothed with a Gaussian filter with a scale of 234. The first 8 points correspond to the first-order scattering coefficients, followed by 8 series of second-order scattering coefficients, one per scale number j₁ and spanning all j₂ values for each.