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 starlet extrema with the full covariance matrix (continuous contours) computed on noisy maps filtered with a four-scale starlet kernel against constraints from starlet extrema with the only diagonal elements of the covariance matrix (dashed contours). Right panel: constraints from the ℓ₁-norm with the full covariance matrix (continuous contours) computed on noisy maps filtered with a four-scale starlet kernel against constraints from ℓ₁-norm with the only diagonal elements of the covariance matrix (dashed contours).