Remote sensing EUV and white-light observations of the eruption from NOAA AR 11726 from 22 April 2013, 08:40 UT onwards. Panels a–c show SDO/AIA observations with photospheric B_z plotted as ±100 Mx cm⁻² contours (blue for negative) over the region included in the vector magnetogram series (Fig. 1). Panel a: pre-eruptive state at 08:36 UT, where the loop system erupting from 08:40 UT onwards is highlighted by the dashed white curve, the location of the solar limb in STEREO A/EUVI observations is shown by the lime dashed curve, and the main structures of the active region are pinpointed by arrows. Panel b: U-shaped location of the expulsion of the material from 09:07 UT onwards (the dashed U-shaped curve), and the likely correlated coronal structure at 09:30:32 UT to the southeast outlined by a red dashed curve. Panel c: post-eruption arcades as well as the site of the M1.0 flare on 10:22 UT. Panels d–f: STEREO A SECCHI/EUVI 195 Å observations at times consistent with panels a–c. Panel d: approximate position and shape of the Cartesian simulation box explained in Sect. 3. Panel e: approximate trajectory of the expelled plasma from panel b (white dashed lines). Panels g–i: composite images of STEREO A/EUVI 195 Å, COR 1, and COR2 white-light observations of the eruption (created using JHelioviewer software Müller et al. 2017). The main coronagraph structures and their visually traced trajectories are illustrated by the white dashed curves and the white dashed arrows, respectively. Movie versions of panels a–c, d–f, and g–h are available online.