Stellar sAMSD two-dimensional distribution of the n = 3.5 profile presented in Fig. D.1 with h = 2.6 kpc at a distance of 21.2 Mpc. The geometrical parameters used for the projection of this profile in the sky are shown in the upper-left corner of the map, while the units for ι_★ are shown in the upper-right corner. The dotted black line indicates the disc scale length. The spatial resolution and pixel scale used here correspond to the values of the W₁ band of WISE.