Panel a: results from radio triangulation studies of type II and type III radio bursts. The yellow sphere represents the Sun, while the red and green spheres represent STEREO A, STEREO B and Wind, respectively. The spheres of varying size represent the radio source regions. The green spheres mark the radio source positions of the FI-type III close to the CME flank. The LF-type II and the FD-type III, denoted by the red and blue spheres, have source positions at the southeast side of the Sun, i.e. close to another CME flank. Panel b: FI-type III, FD-type III, and LF-type II plotted from a different perspective. Panel c: three different type IIIs plotted together.