Main solar wind transients, including three blobs and one CME, observed from the perspective of STEREO-A/B on 3 and 4 April 2010. Panels a–c: running-difference images of COR2 and HI1 on board STEREO-A/B. Panels d/e: time-elongation plot along the PA of 125°/243° for STEREO-A/B COR2 and HI1. Blobs 1-3 and the shock, the ejecta leading edge, the potential prominence material, and the ejecta rear part of the CME are marked in these panels. Panel f: position of the Sun, Earth, and STEREO-A/B on the ecliptic plane at 00:09:01 UT on 4 April 2010. The region between the two solid black rays from STEREO-A or STEREO-B indicates the FOV of HI1, and the lilac region represents the common FOV of STEREO-A and B HI1s.