Source regions of the LF-type II radio burst obtained from radio triangulation presented as observed from different viewpoints namely: STEREO B (left panel), Earth/Wind (center panel), and A (right panel), respectively. The different colored spheres correspond to the respective frequency pairs (in kHz), while their diameters are defined by the distance between the two wave vectors (source region). The plot is in sun-centred x, y, z 3D Cartesian coordinates with R_⊙ units.