Panel a: centroids of the LF-type II emission projected on a SOHO/LASCO C2 image. Their proximity to the streamer stalk region in the plane of sky gives an indication of the probable shock/streamer interaction. Coloured arrows are the streamer regions selected for reconstruction. Panel b: reconstructed streamers (colour coded) plotted together with the type II source regions (distance between the wave vectors) in a plane-of-sky projection similar to the SOHO/LASCO C2 image. The different frequency pairs of the type II source regions are denoted by a rainbow colour scale (Blue hues: high-frequency pairs, Red hues: low-frequency pairs). The source regions of the type II burst are presented as spheres. The smaller spheres (green, olive, and red) are the positions of the reconstructed streamers.