Radial velocity averaged over 50 orbits. We compare the disk with alpha-viscosity (α = 5 × 10^-4, blue curve) to a disk with active VSI (red curve), a disk with active VSI and doubled resolution (red dotted curve) and a viscous disk with anisotropic stress similar to the VSI disk (green curve, details see Sect. 4). For the turbulent disk the velocity has been azimuthally averaged. The profile shown is in units of sound speed c_s0 and at r = r₀. The viscous case has been rescaled to better visualize the difference.