CO(J = 2−1) integrated fluxes as function of CO masses. The black dots represent the observations as in Fig. 1 and the colored symbols are derived from our simulations. The color represents the position of the planet and the symbols the distance of the disk. Our simulated disks are in line with the observed disks; the majority of them are located more than 100 pc away (cf. Fig. 1). We only show the disks in one planetary configuration for the low-mass disk case (m_disk = 10⁻⁵ M_⊕) as the disks are difficult to observe at high angular resolution in this case.