| http://www.w3.org/ns/prov#value | - FIG. 1 is a schematic representation of the apparatus and method of the present invention, showing tool 10 having source 22 and receiver 25, with tool 10 positioned within casing 12 of a borehole 15 that is penetrating subterranean 16, and further showing a gravel pack 18 positioned in the annulus between casing 12 and gravel pack screen 19.
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