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bool absoff=n [y/n] | y - h0 is not in shot coordinate system
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bool adj=n [y/n] | adjoint flag
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bool cmp=n [y/n] | compute CMP instead of shot gathers
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file curv= | auxiliary input file name
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float dh=dx | offset increment
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string dip= | reflector dip file
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float ds=dx | shot/midpoint increment
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float dt=0.004 | time sampling
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float eta= | parameter for VTI anisotropy
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float freq=0.2/dt | peak frequency for Ricker wavelet
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float gradx= | horizontal velocity gradient
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float gradx2= | converted velocity, horizontal gradient
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float gradz= | vertical velocity gradient
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float gradz2= | converted velocity, vertical gradient
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bool lin=n [y/n] | if linear operator
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int nh=nx | number of offsets
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int ns=nx | number of shots (midpoints if cmp=y)
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string picks= | auxiliary output file name
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float r0=1. | normal reflectivity (if constant)
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string refl= | auxiliary input file name
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float refx= | reference x-coordinate for velocity
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float refz= | reference z-coordinate for velocity
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string rgrad= | AVO gradient file (B/A)
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float s0=x0 | first shot (midpoint if cmp=y)
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string slopes= | auxiliary output file name
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bool twod=n [y/n] | 2-D or 2.5-D
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string type= | type of velocity, 'c': constant, 's': linear sloth, 'v': linear velocity, 'a': VTI anisotropy
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string type2= | type of velocity for the converted (receiver side) branch
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float vel2= | converted velocity
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float velz= | vertical velocity for VTI anisotropy
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bool verb=n [y/n] | verbosity flag
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