Figure S6. Figure S6. Phase velocity resolution test at 4 s period with alternating positive and negative velocity anomalies surrounded by neutral velocities. a) The input structure contains 10% velocity anomalies that are 6-km wide and separated by equal-widths of neutral velocities. b) All four input anomalies are recovered with slightly reduced magnitudes, but the anomalies within the interior of the transect are better resolved than those closer to the edges.