Snapshots of the surface density at t = 2, 4, 8, and 100 kyr (from left to right) for the retrograde-streamer model with ﹩{\dot{M}}_{{\rm{in}}}=1{0}^{-6}\,{M}_{\odot }\,{{\rm{yr}}}^{-1}﹩. The infall region and streamer trajectories are overplotted in the same manner as in Figure 2. Retrograde streamer accretion efficiently removes angular momentum from the disk, producing a compact disk with a characteristic radius of R ≲ 100 au.