Top: the synoptic ecliptic-plane field plot for Carrington rotation 2217. The projected locations of STEREO-A (STA) and Earth are added as open circles and their magnetic footpoints mapped back to 2.5 solar radii based on the ballistic model are shown as filled circles. The outer edges of an EUV wave front at different times, i.e., at 05:00, 05:02, 05:07, 05:12, 05:17, and 05:22 on May 6, are marked as colored dashed lines. Bottom: CME observation of SOHO/LASCO (left) and STA/Cor2 (right) at 05:46 on 2019 May 6. The green mesh outlines the GCS reconstruction of the CME geometry. A more in-depth description of this figure can be found in Section 2.4.