Fig. 1.
Slices along a constant meridian of the point-to-point 3D travel-time difference kernel for ur (left) and uθ (right). The 3D kernel for uϕ is zero along this slice. The kernel is computed with r1 and r2 separated by 42°, with mean latitude 40°. The green line is the ray path between the two points and the dashed black line shows the image plane of Fig. 2.
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