Centroids of the moving radio sources projected onto the STEREO-A and -B perspectives over time. The STEREO images in each panel are composed of EUV images at 195 Å from EUVI and coronagraph images from the COR-1 instruments onboard both STEREO-A and -B. Top and bottom panels: STEREO-B perspective, where the first and third moving sources can be seen. Middle panel: STEREO-A perspective, where the second moving source can be observed. The radio centroids coincide with the southern flank of the CME moving further southwards in each panel.