Radially averaged intensity profiles (black line) derived from the synthetic stellar disk images of Fig. 4 and corresponding to RHD simulation with [Fe/H ]  = −3.0 and log g = 1.6. The dashed gray areas denote the one sigma spatial fluctuations with respect to the averaged intensity profile. The intensity is normalized to the mean intensity at disk center and the radius is normalized to the radius given in Table 1.