Time sequence of composite images made from LASCO/C2 (outer) and AIA 193 Å (inner) observations show the wave train in the outer corona. Panel a is made from direct images at about 18:10 UT before the eruption, while others are made from running-difference images. In each panel, the white circle indicates the disk limb of the Sun, while the black plate represents the inner occulting disk of LASCO/C2. We note that the wave train can be identified in panels b–f as coherent white semicircles, while the bright features in panels g–i show the CME associated with the following M7.3 flare.