Evolution of the infall radial velocity |v_r| versus radius over time. The thin lines are plots at the times listed in Table 2, for the fiducial grain radius of a_gr = 0.038 μm. Outside the first core, the magnetic wall causes a small bump. Within the first and second cores material is moving about inwards and outwards with small speeds. This causes spikes when absolute values are plotted on double-logarithmic axes.