Evolution of the radial profile of the angular velocity in a cylindrical disk with a height of 0.03 R_⊙ centred on the mid-plane (left panel) and of the cumulative angular momentum (right panel). The remnant of the unequal-mass merger (blue) initially has a declining omega profile for R > 0.01 R_⊙, but eventually evolves to a flat profile in angular velocity with a local jump around 0.025 R_⊙. Declining rotation profiles are unstable to the MRI. The remnant of the equal-mass merger keeps an outward, constantly declining angular velocity profile. The equal-mass merger (red) has and retains significantly more angular momentum in its inner parts shown here.