Fitting region, Σ, used for disk intensity extraction. Left: Fitting region at V-band. The gray shaded annulus indicates Σ, overplotted on I_disk(x, y)(V) extracted without introducing halo component. Right: Fitting region at Ks band. The gray shaded region indicates Σ at Ks-band, overplotted on I_disk(x, y)(K) extracted using NMF_imaging with improved Σ. The two images are shown in different scales to highlight the Σ, with the black bar indicating 0.5″. The gray dashed lines encloses the region for disk intensity integration.