Left panel: Elongation angle vs. time for the three tracked structures on May 8-10: Beginning of W1 (blue diamonds), end of W2 (red diamonds), and CME6 leading edge (green diamonds). The black continuous line denotes the best HM fit for the three structures. Predicted arrivals to Earth and fitting residues are presented in the figure. Right panel: Jmap at a position angle of 90° for a combination of COR2, HI1, and HI2 on board STEREO-A. Dashed lines represent the mentioned tracked structures: W1, W2, and CME6 respectively in light blue, red, and green.