Dictionary:Reverse control

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Profiles shot from opposite directions; two-way control. 1. The portions of a refractor for which there is overlap of relative delay-time data resulting from shooting in opposite directions (i.e., the subsurface coverage from which arrivals are seen in opposite directions). 2. Sometimes merely the portion of a refraction profile that has been shot from opposite directions. 3. Reflection surveying where dip can be verified by data shot in opposite directions.