Radially averaged intensity profiles (black line) derived from the synthetic stellar disk images of Fig. 3. The gray areas denote the 1σ spatial fluctuations with respect to the averaged intensity profile. The dashed horizontal line is a uniform disk-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. The blue dotted-dashed line in the central and right panels is the average intensity profile of Mark 500 nm. The red dotted-dashed line in the left panel is the continuum-only average intensity profile in Mark 500 nm.