Mock kinematic maps and error maps for Au-23 with viewing angles (θ_T, φ_T) = (85° ,50° ) (denoted as Au-23-85-50 hereafter). Left panels represent the mock kinematic maps and the right panels represent the corresponding error maps. From top to bottom: Mean velocity V, velocity dispersion σ, third-order Gauss-Hermite coefficient h₃, and fourth-order Gauss-Hermite coefficient h₄. We note that the error maps are generated from particle noise, and therefore exhibit similar statistical properties, but their ranges are different (as indicated by the colour bars in the right panels).