TPTC reconnection in the Bifrost simulation. In this figure, time advances downward, unlike in the previous figures, while all three panels per subfigure row show different views of the same snapshot. The left panels show four families of 3D field lines of interest in different colors (cyan, green, magenta, yellow), tracked by corks, above a 2D magnetogram. The magnetogram in the left panel in (c) is transparent by choice to show the magenta field line below the surface. The middle panels show the same, but from directly above. The right panels show only the 2D magnetogram, from directly above, where the cancellation of interest occurs within the red circle. There is no red circle in (d) as the cancellation then has completed.