Logarithm of the density contrast of one slice of 1 Gpc h⁻¹ in height and width and 2 Mpc h⁻¹ in thickness of the Quijote simulation (first and third column) compared with the classification obtained using the T-web (second and fourth column) at different redshifts and smoothing scales. For the T-web classification, the colour bar is the number of eigenvalues above our chosen threshold Λ_th = 0.01 chosen specifically for good visual agreement.