Comparison of the recovered stellar kinematic parameters in the case of mock spectra without noise (top four panels) and with S/N = 50 pixel⁻¹ (bottom four panels). In both cases the mean velocity v (upper left panel), velocity dispersion σ (upper right panel), and higher-order moments h₃ (bottom left panel) and h₄ (bottom right panel) of the LOSVD of two counter-rotating components are known as a function of their input velocity separation ΔV. The points correspond to the measured values for mock spectra with f_cr = 0.17 (red), 0.23 (orange), 0.33 (light-blue), and 0.50 (black), respectively. The points are connected to highlight the trend. The black solid lines indicate the input value of the mean velocity (v = V_pro), velocity dispersion (σ = σ_pro), and h₃ = h₄ = 0 as a function of ΔV. The black dashed lines indicate the default limits to the higher-order moments.