Quasi-spherical CME shock and its 3D reconstruction in multi-instrument views. Top row: Quasi-spherical CME shock (indicated with arrows) as seen from base-difference STEREO-A 195 Å images from 11:22 to 11:32 UT. Bottom row: 3D reconstructions of the outer CME front based on epipolar geometry and two viewpoints, from Solar Orbiter and STEREO-A. (a) Solar Orbiter/EUI 304 Å and (b) STEREO-A/EUVI 195 Å base-difference images. (c) 3D coordinates of the reconstructed CME front outer edge based on epipolar geometry (green markers) and the ATLAS-3D method (red markers). (d) LOS projections of 3D coordinates of the CME front outer edge to the SDO/AIA 195 Å view in base-difference and (e) running-difference images.