Mock surface brightness, stellar kinematic data, and best-fitting model for Au-6 with an inclination angle ϑ = 60°. From left to right: logarithmic normalised surface brightness, mean velocity V, velocity dispersion σ, skewness h₃, and kurtosis h₄. From top to bottom: mock observations, model fittings, and residuals. The residuals represent the relative deviations of the surface brightness and the standardised residuals of the kinematics.