Azimuthally averaged profiles of the gas surface density in models 1, 2, and 3 (from top to bottom). Only late evolution times, when the gap has fully developed, are shown. The dotted tangent lines connect the radial density profiles in inner and outer disks. The arrow illustrates the contrast in the gas surface density in the gap at t = 0.3 Myr. The time is counted from the formation of the central star.