Zoomed-in dynamic spectrum of the type II burst and images of the source location along the leading edge of the two lanes. The top panel shows the start of the harmonic type II lanes in the LBA dynamic spectrum. The color-coded dots track the leading edges of the two lanes. The middle panels show the color-coded contours of the source locations for both lanes overlaid on GOES/SUVI 195 Å running difference images of the CME eruption. The contour levels are at 50 and 70% of the maximum intensity in each image. The bottom panel shows the Y-axis distance between the two radio sources using the same colour-coding and their separation as a black dashed line.