| http://www.w3.org/ns/prov#value | - This method is especially useful in the case of complex sub- surface structures that are dif?cult to treat analytically.An example of a ray-tracing interpretation is illustrated in Fig. 5.14.The ray-tracing method is particularly valuable in coping with such complexities as horizontal or verti- cal velocity gradients within layers, highly irregular or steeply dipping refractor interfaces and disco
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