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Keywords from Image Description:
IASP. The IASP Earth Reference Model Kennett Engdahl giving and wave velocities grey and black lines resp in the earth's interior Das IASP ReferenzErdmodell Kennett Engdahl Die Linien zeigen die seismischen Geschwindigkeiten fr und PWellen grau bzw schwarz im Erdinneren IASP Own th August August Ingo Wlbern provide this figure