Wavelength dependence of the detectability of a gap induced by a planet with η = 0.001 in a circumstellar disk depending on the disk mass, the host star, the disk size, and the ALMA configuration. Both grain species are considered. The assumed exposure time amounts to two hours. The simulations for a combination of a total disk mass of M = 2.67 × 10^-2 M_⊙ and a scaling factor k < 10 were not calculated. For the scaling factor k see Fig. 5; for the resulting angular resolution depending on wavelength and ALMA configuration see Fig. 3. The scale of one pixel is 0.00064″×k.