Panels a–d) sequence of 3D prominence reconstructions as obtained from EUVI data acquired at 20:18 UT (green lines), 20:33 UT (red lines) and 20:46 UT (blue lines). The 3D reconstructions are shown as seen by an observer placed on Earth (XoY plane, panel a)), on the ecliptic plane above the west limb (ZoY plane, panel b)), on the plane of sky above the north limb (ZoX plane, panel c)), and above the eruption site (panel d)). The XYZ axes are those of the standard heliographic coordinate system, having the origin o at the Sun center and the X-, Y-, and Z-axes pointing toward the west limb, the north limb, and the Earth, respectively. Panels e–h) sequence of 3D prominence reconstructions as obtained from COR1 data acquired at 21:15 UT (green lines), 21:30 UT (red lines) and 21:45 UT (blue lines). The 3D reconstructions are shown as seen from the same reference systems as those employed for the reconstructions resulting from EUVI data.