Distribution of vertical vortices (inclination ι < 20°, left column) and horizontal vortices (ι > 70°, right column) on horizontal planes. Pixels corresponding to swirling periods τ_s < 240   s are indicated in green color on cuts of the vertical velocity at z = 0 (average height of the optical surface) for the non-magnetic case (top row) and for the magnetic case (second row). Similarly, the strong swirls are indicated on maps of the vertical magnetic field component at z = 0 (third row) and at z = 644   km (bottom row) for the simulation with magnetic field.