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Fig. 2. Sample impulse responses, riest(t), viest(t) and the receiver functions, Fest(t) for an earthquake in El Salvador (range = 30.7 deg) observed at PAL. A) Broadband vertical, V(t), and radial-horizontal, R(t), components. B) Sequence of viest(t) for L increasing from 1 to 5. C) Sequence of riest(t). D) Sequence of Fiest(t). E) Sequence of observed (bold) and predicted (solid) radial-horizontal seismograms, R(t). The misfit, as defined by Eqn. 8, decreases from 0.034 for L=1 to 0.003 for L=5, about an order of magnitude improvement.