Mock stellar kinematic, age, and metallicity maps (left panels), and their corresponding error maps (right panels) for Au-23 with viewing angles, (θ_T, φ_T) = (85° ,50° ),  with 1 arcsec = 0.2 kpc. From top to bottom: Mean velocity, V; velocity dispersion, σ; third-order, h₃, and fourth-order, h₄, Gauss-Hermite coefficients; stellar age, t; and stellar metallicity, Z. The kinematic maps and their error maps are the same as Fig. 2 of Jin et al. (2025). We note that the kinematic error maps exhibit similar statistical properties as they are generated from particle noise (Tsatsi et al. 2015), but their ranges are different (as indicated by the colour bars in the right panels).