EUV and coronagraph observations by STEREO-B (left), near-Earth (middle), and STEREO-A (right). Upper panels: EUV images taken by EUVI 195 Å and AIA 171 Å (middle). AR6 is indicated by the orange circle in STEREO-A and STEREO-B, and AR2 and AR3 by the purple circle in SDO. Second and third rows: evolution of the CME at two different times, seen from three different points of view, as observed by the LASCO (magnified image) and SECCHI coronagraphs. The CME-driven shock front is shown with yellow dashed curves (as a rough outline to guide the eye) and the flux-rope structure is indicated with yellow and white arrows. The red arrow indicates the disturbance caused by the first stage (details given in main text). Credit: JHelioviewer/cdaw.gsfc.nasa.gov.