Temporal evolution of the angular-momentum parameters β (left) and γ (right) for the retrograde-streamer model with ﹩{\dot{M}}_{{\rm{in}}}=1{0}^{-6}\,{M}_{\odot }\,{{\rm{yr}}}^{-1}﹩. A sharp increase in β at 100 au ≲ R ≲ 400 au between t ≈ 6 and 10 kyr, together with the distinct angular-momentum evolution of the inner (R ≲ 100,  au) and outer (R ≳ 100,  au) regions, suggests the onset of disk breaking.