Vertical component of the magnetic field at 2 Mm, with direction of horizontal velocity vector, u_xy. We utilise the periodic boundaries to display the swirl S2, but note that the domain analysed in this study stays within the axis boundaries, as outlined by the solid black box. The vertical cuts through the domain used for analysis are displayed for reference by the solid and dotted lines, whilst the three main swirls are highlighted by the black boxes. V1 refers to x = 4.99 Mm, V2 to y = 11.72 Mm, and V3 to x = 8.33 Mm.