Dependence of clump migration on M_MCC in disks with T_MCC = 15 K and ω = 2.8 × 10⁻¹⁴ s⁻¹. Using different line styles, we differentiate different M_MCC. Each pair of the lines with the same style represents the time evolution of the radial positions of the clumps forming at the inner and the outer boundary of the fragmentation region at t = t_infall in a protoplanetary disk with a specific M_MCC. The pairs of the dashed, short-dashed, solid, short-dotted, and dotted lines represent the evolution of the radial positions of clumps forming in disks with M_MCC = 0.6 M_⊙, 0.8 M_⊙, 1.0 M_⊙, 1.2 M_⊙, and 1.5 M_⊙, respectively. Other information is the same as Fig. 1.