Table S8. Goodness of fit for various arrivals in velocity anomaly extends into the lower crust. Run08A 1.9 km deep and 12 km wide depression of the 4-5 layer interface beneath the DSB area. Phase RMS(s) Chi Squared Number of Points 41 0.203 4.138 524 42 0.157 2.469 1015 51 0.218 4.767 231 Run08B 3 km deep and 40 km wide depression of the 4-5 layer interface beneath the DSB area. Phase RMS(s) Chi Squared Number of Points 41 0.202 4.104 522 42 0.147 2.154 994 51 0.178 3.179 309