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Figure 2 – Section view of Earth layering that is to be imaged. A 3-D designer needs to know two critical depths: (1) depth Z1 of the shallowest reflector that has to be Imaged, and (2) depth Ztar of the primary target to be studied. If multiple targets exist at various depths, then Ztar should be defined as the depth to the deepest target. The shallow target depth Z1 controls the source-line and receiver-line spacings, which should be no larger than the offset distance Xmin shown here. The deep target depth Ztar defines the physical size of the recording swath, which should span an area having a width of about 2Xmax in both the in-line and cross-line directions.