First three columns: selected time series observations of the CME in composite images taken by STEREO-B, SDO and SOHO, and STEREO-A (from left to right). The solar center is located at the center of each panel and the solar rotational axis is the north of each image. The white circle in each panel refers to the solar disk. Images at the center of each panel are running difference images from STEREO/SECCHI/EUVI 195 Å in the first and third columns and running ratio images from SDO/AIA 193 Å in the second column. White light observations are running difference images from STEREO/SECCHI/COR-1 and STEREO/SECCHI/COR-2 in the first and third columns and SOHO/LASCO/C2 in the second column. The representations of the reconstructed 3D shock front are indicated by the red, orange, blue and cyan lines whereas the white line shows the maximum extension of the shock front. Dashed lines are used when the 3D structure is located in the other side of the plane of the image. Right Column: projection of the ellipsoid shock front in the ecliptic plane as seen from the north ecliptic pole. The red, blue and black lines indicate the magnetic field lines connecting to STEREO-A, STEREO-B and L1, respectively, computed assuming Parker IMF lines above 2.5 R_⊙ and the PFSS configuration below 2.5 R_⊙ (gray color is used for the portion of the field line inside the modeled ellipsoid).