PIONIER and NaCo/SAM (squared) visibilities with the predicted visibilities for the final best model (full line), under the approximation of isotropic scattering (red) and full scattering (green; i.e., also including non-isotropic scattering). The dotted green line shows the predictions for the same model, but this time with large grains in the disk atmosphere (simulated by increasing the turbulence strength α from 10^-5 to 10^-3). Finally, the dashed line again shows the predicted model visibilities of the best model, but now with an outer radius of 200 AU for the < 10-μm sized grains.