Trajectory of the AR12473 (orange) and AR11176 (blue) TMFM FRs. The top left panel shows the height evolution, while the top right panel shows the evolution of the horizontal components during the ascend of the FRs. The bottom left panel shows the 3D trajectory in grey, with each computed apex point marked as an orange or blue dot; the start and end points are in black for better visibility. The bottom right panel depicts the angle of propagation for each time step. The frame numbers are normalised to start from 0 once the FR has formed.