Early interplanetary evolution of the CME. Top panels: coronagraph base-difference images of COR2/STEREO B (left), C3/SOHO (center), and COR2/STEREO A (right) taken on February 4 at 03:30 UT. The arrow points to the secondary structure southeast of the main ejecta. Bottom panels: GCS reconstruction of the erupted structure plotted over the corresponding images in the top panels. The green grid envelops the CME body from its front to its footpoints at the Sun.