Ratios between mass fractions in the cosmic web environments and mass fractions obtained with fiducial cosmology for an eigenvalue threshold of when varying (left)Ω_m, Ω_b, h, n_s and σ₈ or (right)M_ν. Points are centred on the average over the N_deriv = 500 realisations for each cosmology and error bars show the ±3σ interval. The grey shaded area corresponds to the ±3σ interval of the fiducial cosmology fractions obtained from the N_fid = 7000 realisations.