Three-dimensional shock reconstruction based on the geometrical ellipsoid model of Kwon et al. (2014). Left and middle column panels: running difference EUV and WL coronagraphic images of the solar corona, from near-Earth instruments (SDO/AIA at 193 Å and SOHO/LASCO-C2 and C3) on the left, and from STEREO-A (EUVI at 195 Å and STEREO-A/COR1 and COR2) in the middle. The ellipsoid fitted to the shock front is over-plotted. The red, orange, blue, and cyan coloured lines represent the four quadrants of the modelled ellipsoid. The white circles are used to indicate the intersection of the ellipsoid with the solar surface (the dashed lines are used when the structure is on the far side of the Sun from the observer’s point of view). On the top panels, the coloured symbols mark the footpoints of the nominal Parker spiral field lines that connect to PSP (white), SolO (yellow), STEREO-A (red), and Earth (green). The right column shows the position of the ellipsoid projected at the ecliptic plane as seen from the northern ecliptic pole and the nominal Parker spiral field lines that connect to PSP (black), SolO (yellow), STEREO-A (red), and Earth (green).