| http://www.w3.org/ns/prov#value | - mation is not homogeneous, for example if water has been injected into the well during the boring, one finds around the well two substantially concentric regions, the nearest to the well is invaded by drilling mud and its resistivity isRxo, the furthest away from the well is blank, its resistivity is Rt and one strives to find out how it changes over time.
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