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A 3-D seismic data volume is like the room-temperature example except for two changes:
 
A 3-D seismic data volume is like the room-temperature example except for two changes:
   −
* The vertical axis is vertical reflection time, not depth.
+
* The vertical axis is two-way traveltime, not depth.
 
* The data values are [[seismic amplitude]]s rather than temperature.
 
* The data values are [[seismic amplitude]]s rather than temperature.
  
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