Example realisations of the stacks (top row), and the residuals (bottom row) after stacking the slingshot signal of 8438 halos and subtracting the best fit. Left panels: noise per pixel of σ_ΔT/T = 4 × 10⁻⁶, resembling current surveys. Central panels: “near-future” noise levels of σ_ΔT/T = 1 × 10⁻⁶, and rightmost panels: very low noise per pixel (σ_ΔT/T = 1 × 10⁻⁷) to visually see the emergence of an image. The individual images are scaled with respect to the virial radius of the halo before stacking. The x- and y-axes are in units of the virial radius of the halo.