Time sequence of a single swirl event from t = 5760 s to t = 6160 s. From top to bottom row: vertical component of the magnetic field B_z at z = 0 km, continuum intensity I, vertical velocity v_z at z = 700 km, vertical component of the swirling vector λ_z at z = 700 km, vertical component of the magnetic swirling vector at z = 700 km, and the bin-5 intensity I₅. Maps of λ_z and also show the streamlines of the velocity field and the magnetic field projected into the horizontal plane at z = 700 km, respectively.