Normalized cumulative fluxes of various fits used to model the interferometric visibilities of RXJ1556.1-3655 disk, used for the size determination. The results are shown for the following models: a Gaussian distribution as in Eq. (2) (illustrated in red), the Nuker profile from Eq. (1) (blue), a broken power-law (green), and for the “two-layer” approximation physical model to describe the disk (orange). The radii enclosing 68% and 95% of the total flux for each model are shown as dashed and dotted lines respectively.