Observed (color) and modeled (black) visibility for the star HD 48543B. The FT, HD 48543A, is located at 7.90 arcsec from the SC. During the observation, the MASS-DIMM measured a seeing ϵ of 0.41 arcsec and an isoplanatic angle θ₀ of 1.7 arcsec (at 500 nm), which is 10.0 arcsec in K-band. AT1-AT2-AT3-AT4 correspond to the stations A0-G1-J2-K0. The model by Elhalkouj et al. (2008) is able to explain the visibility loss from atmosphere anisoplanatism.