95% confidence contour tomography with source redshifts z_s = [0.5,  1.0,  1.5,  2.0] and corresponding galaxy number densities n_gal = [11.02,  11.90,  5.45,  1.45]. The dotted black line is the fiducial model: [∑m_ν,  Ω_m,  10⁹ A_s]=[0.1,  0.3,  2.1]. Left panel: constraints from the power spectrum (light blue contours) computed on noisy maps smoothed with a Gaussian filter with θ_ker = 1 arcmin, compared to constraints from the starlet ℓ₁-norm (dark blue contours) computed on noisy maps filtered with a four-scale starlet kernel. Right panel: constraints from the combination of peaks and voids (magenta contours) computed on noisy maps smoothed with a Gaussian filter with θ_ker = 2 arcmin compared to constraints from starlet peak counts (green contours), starlet extrema (orange contours), and the ℓ₁-norm (dark blue contours), computed on noisy maps filtered with a four-scale starlet kernel.