Schematic configuration of the three spacecraft positions: L1 (SoHO and WIND), STEREO A, and STEREO B. The curved lines correspond to the Parker spiral connecting the source surface to STEREO B and to Earth. The dashed lines represent the Parker spirals connected at the source surface (2.5 R_⊙) to the open magnetic field lines through the type III source at 150 MHz. The solid line shows the line of sight from the Wind/Waves experiment to the type III burst source at 1.04 MHz.