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* Direction away from the well to distant source cannot be determined without other information
 
* Direction away from the well to distant source cannot be determined without other information
* Engineering limitations of the tool restricts use to certain candidate wells (hole size, low deviation, slow reading)
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* Engineering limitations of the tool restricts use to certain candidate wells ([[hole size]], [[low deviation]], slow reading)
 
* Only a few tools presently available for use
 
* Only a few tools presently available for use
 
* Expensive to operate
 
* Expensive to operate
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