Radial brightness profile of a simulated ALMA map of model D2G_e-2 at a wavelength of 1.3 mm and a distance of 75 pc. Compared to the local flux maximum at 60 AU, the significance of the flux decrease at about 55 AU is 7.7σ. The dashed line shows the radial brightness profile of a disk that is perturbed by a giant planet with a planet-to-star mass ratio of 0.001. The remaining disk parameters correspond to model D2G_e-2. The 10σ level is indicated by the dotted line. The blue line is an auxiliary line that visualizes the maximum flux of the outer disk (red line) at any other location.