Locations and shock geometry of the double type II sources. (a) Radio contours of the double source at 70% of the maximum intensity level in each image, overlaid on a GOES/SUVI 195 Å running difference image. (b) Cartoon showing the location of the type II bursts and local shock geometry that is likely to explain the double source separation. As the non-uniform shock front expands between times t₁ and t₂, the separation between the radio sources increases from d₁ to d₂.