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float da=90. | angle sampling (in degrees)
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bool depth=n [y/n] | if true, depth migration
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float dh= | Offset sampling (for modeling)
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float dt= | Sampling of time axis (for modeling)
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float dz=dt | Sampling of depth axis (for migration, if no velocity file)
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float eps=0.01 | Stabilization parameter
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bool inv=n [y/n] | If y, modeling; If n, migration
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int na=1 | number of angles
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int nh= | Number of offsets (for modeling)
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int nt= | Length of time axis (for modeling)
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int nz=nt | Length of depth axis (for migration, if no velocity file)
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string rule= | phase-shift interpolation rule (simple, midpoint, linear)
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float vel= | Constant velocity (if no velocity file)
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string velocity= | file with velocity (file with velocity (auxiliary input file name))
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