Flow rates along the filaments in the active cube. The colour bar represents the velocity magnitude at that point. Top: 3D filament corresponding to filament 1 in Figure 3a. It feeds the central massive clump. Bottom: 3D filament representing filament 3 in Figure 3a. It feeds the non-central clump. Negative values represent positions leftwards of the clump, i.e., lower values of x and y. On the x-axis, 0 corresponds to the clump position.