model and observations are restricted
to the spectral range 15-40 and are displayed at an altitude 400
km. Sea floor spreading isochrons are shown as solid black.
Lines in the Atlantic and the mid-Atlantic ridge is shown as a thick
black line. K identifies anomalies due to the Cretaceous Quiet Zone. R
identifies anomalies due to the ridge axis, W identifies Walvis
ridge anomaly(Purucker and Dyment, 2000).
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