Average in radial shells of the square of the transverse component of particle velocities (in units in which is unity), as a function of radius, at each of the indicated times, for a simulation with N = 10⁵ particles of spherical initial conditions with α = 1. Note that already well before the system reaches it maximal contraction, at t ≈ 1, the Poissonian fluctuations breaking spherical symmetry have been amplified to produce tangential velocities larger than in the final virialized state.